Kendal can correct the SVO radio options if I'm wrong.

Four radio options in '84...

AM radio (code 2 on door tag).....................standard in L, LX, GT, Turbo GT
AM/FM stereo (code 4).............................standard in SVO before Comp Prep (CP) available, optional in L, LX, GT, Turbo GT
AM/FM stereo w/ cassette (code 8).................standard in non-CP SVO after CP available, optional in L, LX, GT, Turbo GT
radio delete (code Y).............................standard in CP SVO, optional in L, LX, GT, Turbo GT


And the "Premium Sound System" was standard in the non-CP SVO and optional in anything else that has a stereo radio.

Build sheet radio codes...

A = AM
D = radio credit (delete)
R = AM/FM stereo w/ cassette
S = AM/FM stereo


Build sheet speaker codes...

[blank] = two front speakers only (standard with AM radio and radio credit)
4 = 4 speakers
Z = 4 speakers (Premium Sound)