[jeff morocco]

i found this... its a sample off someones trim tag. looks like the XZ is unknown.and the R-R is red upper / lower

05D ~ Assembly Date ~ May, 4th week
5884 ~ unknown
ST 68-13427 ~ 1968 Chevelle 300 Deluxe 2-Door Sedan (3,796 units)
KAN ~ Body Assembly ~ Kansas City, Missouri (Leed's)
2234 BODY ~ Fisher Body data processing number
TR 770-A-XZ ~ Dk. Blue Ramara-Rapture-Richmond Cloth/Imitation Leather (bench seat)
XZ ~ unknown
D-D PAINT ~ Grotto Blue (lower-upper)

Note the Buick seat style as noted on the trim tag with the -178 code