Here is the number and % of 1975 Electra Limited 4 door hardtops produced with each option.
* indicates the options/characteristics mine has.

-1975 Electra Limited 4 door total:---------------33778___100%*
-AGI 6 way power driver seat:----------------------32927___97.5%*
-AG2 6 way power passenger seat--------------13873___41.1%*
-AM6 60/40 seat---------------------------------------27699___ 82.0%*
-AR3 air bag restraint------------------------------------123___0.4%*
-AT7 40/40 seat-----------------------------------------6079___18.0%
-AU3 power door locks------------------------------28643___85.4%
-AU4 Automatic door locks---------------------------3194___9.5%*
-A01 tinted glass--------------------------------------33386___98.8%*
-A02 tinted windshield----------------------------------272___0.8%
-A03 plain glass------------------------------------------120___0.4%
-A90 trunk release------------------------------------25097___74.3%*
-B32 carpet savers-----------------------------------25919___76.7%*
-B33 handy mats-------------------------------------24321___72.0%*
-B75 trunk carpeting-----------------------------------6844___20.3%*
-B93 door guards-------------------------------------23356___69.1%*
-CD4 pulse wipers-----------------------------------15088___44.7%*
-C41 standard heater (no a/c)--------------------------53___0.2%
-C49 electric rear defroster------------------------15478___45.8%*
-C60 manual a/c--------------------------------------20271___60.0%
-C61 automatic climate control-------------------13454___39.8%*
-C90 door warning lamps--------------------------14018___41.5%*
-DE6 mini console---------------------------------------545___1.6%
-DE9 Park Avenue console--------------------------6079___18.0%
-DF3 remote passenger mirror-------------------16933___50.1%*
-D64 lighted passenger visor mirror-------------17720___52.5%*
-D65 left mirror with thermometer------------------9029___26.7%*
-F40 firmride suspension----------------------------4790___14.2%*
-GM8 2.56 axle ratio---------------------------------------10___0.03%
-GU2 2.73 axle ratio----------------------------------33709___99.8%*
-GU5 3.23 axle ratio---------------------------------------59___0.2%
-G67 automatic level control-------------------------2941___8.7%*
-G80 limited slip rear axle----------------------------5027___14.9%*
-K30 cruise control-----------------------------------29043___86.0%*
-K97 80 amp alternator-------------------------------1029___3.0%*
-L74 455 engine---------------------------------------33778___100%*
-M40 THM 400 transmission-----------------------33778___100%*
-NB4 california emissions----------------------------1344___4.0%
-NB5 single exhaust----------------------------------33778___100%*
-N33 tilt steering---------------------------------------23831___70.6%
-N37 tilt/telescope steering---------------------------7073___20.9%
-N96 chrome wheel imitation wheelcover----------509___1.5%
-PA1 wire wheelcover----------------------------------4228___12.5%
-PO5 chrome wheel------------------------------------5827___17.3%
-QBC blackwall JR78-15 tires-------------------------145___0.4%
-QBN wide whitewall JR78-15----------------------5325___15.8%
-QEX whitewall JR78-15----------------------------28307___83.8%*
-TP1 maintenance-free battery----------------------1809___5.4%*
-T53 front fender moulding-------------------------21831___64.6%*
-T63 headlamp-on buzzer and indicator light---4699___13.9%*
-T87 cornering lamps--------------------------------19769___58.5%*
-UM1 am radio with 8 track tape--------------------2308___6.8%
-UM2 am/fm stereo with 8 track tape-------------12693___37.6%
-UR1 fuel usage gauge-------------------------------8367___24.8%*
-U09 four note horn-------------------------------------8584___25.4%*
-U15 speed alert and trip meter-------------------21561___63.8%*
-U18 kilometer speedometer--------------------------802___2.4%
-U41 low fuel indicator--------------------------------10719___31.7%*
-U46 front and rear light monitors-----------------17936___53.1%*
-U58 am/fm stereo------------------------------------15483___45.8%*
-U63 am radio--------------------------------------------1047___3.1%
-U75 automatic power antenna--------------------12816___37.9%*
-V31 front bumper guard-----------------------------28644___84.8%*
-V32 rear bumper guard-----------------------------28644___84.8%*
-WH9 Park Avenue with 60/40 seat-------------------588___1.7%
-W10 Park Avenue with 40/40 seat and console-6042___17.9%
-W16 leather 60/40 seats------------------------------2780___8.2%
-W18 Park Avenue deluxe---------------------------------37___0.1%
-Y40 heavy duty cooling---------------------------------6907___20.4%*
-Z49 Canada equipment modifications------------1778___5.3%*