i have found my answer though i would put it here incase anyone was interested
Alpha-numerical accessory codes
To add to the already complex alpha-numerical coding systems in use, Cadillac used also a list of alphabetical accessory codes. Here are some additional ones drawn from dealers' Data Books of the 50s and 60s [and other sources too]. Some letter codes may have up to four different possible meanings, depending on the year of the Cadillac in question:
"A"(1) Rear-window de-fogger ($26.35 - 1970 dealer invoice)
"A"(2) Two rear seat belts [e.g. 1965]
"A"(3) Seat warmers [after 1966?]
"B"(1) The letter "B" following a trim code was an indication that the car was fitted with
bucket seats [1959-66].
"B"(2) Rear-window defogger
"C"(1) Cruise-control ($ 96.60)
"C"(2) Back- rest lock on some coupes
"D" Door edge guards ($9.50 - 1970 dealer invoice)
"E" E-Z-Eye glass (or Soft-Ray glass, e.g. 1970) glass ($ 51.70)
"F"(1) Fog lamps ($ 45.55)
"F"(2) Filler plate, i.o. license plate ( no charge ) [e.g. 1966]
"F"(3) AM-FM radio in 1963
"FF" [same]
"F5" Twin rubber floor mats front and rear ($ 16.70 - 1970 dealer invoice)
"G" Controlled differential (e.g. 1965)
"H"(1) Heater ($129.00)
"H"(2) Delete heater-defroster (1965 option)
"H"(3) Head rests [1966]
"I" AM/FM signal-seeking radio ($322.10 - 1970 dealer invoice)
"J"(1) Rear radio control ($246.60) (Series 75 only)
"J"(2) [after 1965] Twilight Sentinel
"K" Air-conditioning [or Comfort Control, or Automatic Climate Control, e.g. in 1970] ($473.60)
"K2" Air-conditioning with roof ducts [1956 models] - may look like "KZ"
"L" Automatic level control [circa 1966]
"L1" One license frame ($ 7.50)
"L2" Two license frames ($ 15.00)
"M" Electric door locks ($ 45.75)
"N" Electric powered vent panes ($ 73.20)
"O" Front seat belts (e.g. 1965)
"O2" Delete front belts
"P"(1) [e.g. 1953 Eldorado] windshield washer [per Fredus "Pete" Peters, CLC]
"P"(2) [e.g. 1954 Eldorado] 4-way power seat
"P"(3) Optional gear ratio (only with standard engine without air-conditioning)
"P"(4) Automatic level control (e.g. 1965)
"Q" Eldorado motor ($134.30 (three dual barrel carburetors)
"Q" [as of 1965] Tilt and Telescope steering wheel ($94.75)
"R"(1) Reclining Bucket seat
"R"(2) AM radio (1965, e.g.); code also seen on 1954 Eldorado.
"R1" AM-FM Radio
"R2" Rear radio controls (Fleetwood 75 models)
"S" Electric remote trunk release ($ 58.50)
"T"(1) Air-Suspension where not standard equipment [1959-60]
"T"(2) Electric 4-way, bucket seat adjuster
"U" Autronic-Eye [automatic headlamp control, dimmer; later was Guide-Matic] ($ 55.25)
"V"(1) (1954) - - electric 4-way bench seat
"V"(2) 6-way electric seat [see also "Y", below]
"V"(3) 2 front seat belts [1963-64]
"W" Whitewall tires ($40.00 - 1970 dealer invoice)
"X" Power windows ($118.45)
"Y" 6-way front seat ($118.45) Deleting 4-way seat ($ 89.35)
"Z" Anti-freeze [-20°] ($ 9.13) [$7.72 on a 1959 invoice!]
"Z1" Anti-freeze [-40°] ($ 9.13)
"Z2" Methanol ($ 9.13)
