Baltimore, Maryland ~ Section 6 - 77 through 92

Box 77: CARPET FRONT
Not used

Box 78: CARPET REAR
Not used

Box 79: H/LINER
This box contains one of two 3-digit numbers but no correlation to headliner color.
273 ~
293 ~

Box 80: W/HOSE
This box contains a 4-digit code. No idea what this code represents as it appears on all sheets
41 39

Box 81: SHELF TRIM
Not used

Box 82: SEAT ADJUSTER
Not used

Box 83: PAD FRT BACK
Not used

Box 84: PAD FRT CUSHION
This box contains a 3-digit number or 3 hyphens ( --- )
--- ~ no console
566 ~ console

Box 85: PAD REAR BACK
This box contains a 4-digit number matching interior color
5400 ~ 787, 788 red
5470 ~ 795, 796 green
5475 ~ 755, 756, 791 black, ivory
5498 ~ 762, 764, 765 blue
5499 ~ 770, 771 saddle
7099 ~ 776 turquoise

Box 86: PAD REAR CUSHION
This box contains a 2-letter code
NX ~ El Camino through at least 03-16
NY ~ Found with #57 SEAT BELTS after at least 11-11
PB ~ El Camino after at least 03-24
PC ~ Found with #45 SEAT BELTS after 11-14

Box 87: SEAT BELTS
This box has a 2-digit code for seat belts. Prior to 11-14 this box was not used. There is no correlation between standard or deluxe belts or, obviously, belt color since only two codes are shown.
45 ~ after at least 11-14
57 ~ after at least 11-14

Box 88: SHOULDER HARNESS
Only one sheet has any entry here, a convertible with BF dated 04-01

Box 89: DOOR PADS
Not used

Box 90: IP PADS
This box contains a 3-digit code based on interior trim color and number of front speakers.
052 ~ black/ivory trim with none or 1 front speaker
061 ~ gold trim with none or 1 front speaker
066 ~ gold trim with none or 1 front speaker
067 ~ gold trim with 2 front speakers
068 ~ red trim with none or 1 front speaker
069 ~ red trim with 2 front speakers
070 ~ blue trim with none or 1 front speaker
071 ~ blue trim with 2 front speakers
072 ~ saddle trim with none or 1 front speaker
073 ~ saddle trim with 2 front speakers
074 ~ green trim with none or 1 front speaker
075 ~ green trim with 2 front speakers
461 ~ black/ivory trim with 2 front speakers

Box 91: WHL. CVRS.
323 FJ ~ used after at least 03-06
770 FJ ~ used at least up to 03-03

Box 92: SPEEDO GEAR & ADAPTER
This is one of those codes that does not appear to have a clear cut application. There appears to be multiple codes used for the same engine/transmission/rear end throughout the year.
L34:
IR F - ~ 3.31:1 (CF) with M20 transmission
50 F - ~ 3.31:1 (CF & CW) with M21 transmission (10-23 thru 12-01)
50 F A ~ 3.31:1 (CF) with M21 transmission (02-03)
1A F - ~ 3.31:1 (CF) with M20 transmission (01-12)
KY R - ~ 3.31:1 (CF) with M40 transmission
KY X - ~ 3.31:1 (CF & CW) with M40 transmission

L78:
IR F C ~ 4.10:1 (KK) with M20/M21 transmission (11-19, 11-20)
2G F - ~ 3.55:1 (KF & KJ) with M21 transmission
50 F - ~ 4.10:1 (KK) with M21 transmission
8T F C ~ 3.55:1 (KF) with M20 transmission

LS5:
GB S - ~ 3.31: (RV) with M40 transmission (01-22, 01-29)
GB X C - ~ 3.31:1 (RU & RV) with M40 transmission (04-16, 05-04, 05-15)
IR F - ~ 3.31:1 (RV) with M22 transmission

LS6:
IR F - ~ 3.31:1 (RV) with M22 transmission
IR F C - ~ 4.10:1 (RW) with M22 transmission
FR S - ~ 4.10:1 (RW) with M40 transmission
KY R - ~ 3.31:1 (RV) with M22 transmission
KY X - ~ 3.31:1 (RV) with M40 transmission
LG R - ~ 4.10:1 (RW) with M40 transmission
LG X C - 4.10:1 (RW) with M40 transmission