SPD = Scheduled Production Date it will be on the top line of the b'cast sheet to the left of the VIN ..... SPD 123456 RM23 V0E 123456
(I used to own RS23V0E131247, I purchased it in Denver '05)LA b'cast sheets are pretty rare, can you post a pic?
If the car was a pre-December '69 build (LA may have varied on this date??), the tires would be as pictured above, later cars had the "GOODYEAR" & "POLYGLAS F70-14" in RWL.
T87 = Goodyear Polyglas F70-14 w/Raised White Letters
17 = 14x6.0" painted steel wheel (what color was the car originally?)
88 = part #2944088 - stainless steel "PLYMOUTH DIVISION" dog dish hub caps
Here's a prior thread about the same subject & the unique to LA plant 14x6.0" wheel is discussed.
Moparts wheel thread with the "usual suspects"!
.JPG){kind=link}