Wierd, M33 and V5X are both noted for body side molding but on the decoders I tried they don't differentiate it. As far as the V5_ code, the X was for black. I guess there were numerous colors you could have gotten so check your codes, bentpshrods. Don't know how many of these different colors relate to the V5_ option.
V4* 71 Vinyl Canopy Roof (See V1* for Colors)
V5* 69-71 Body Side Molding
V6* 69-71 Longitudinal Stripes
V7* 69-70 Accent Stripes
V8* 69-71 Transverse Stripes
V9* 70 Bumble Bee Stripes
V9* 71 Longitudinal Stripes
V5* thru V9* Missing digit represents color choices
A- Gunmetal
B- Light Blue
C- Plum Crazy
D - Dark Blue
E - Bright Red
F - Green
H - Trans Am Black
J - Chartreuse
K - Go Mango Orange
M - Magenta (1970 Only)
M - Burgundy (1971 Only)
R - Red
T - Tan
V - Orange
W - White
X - Black
Y - Yellow
8 - Delete
I have the V5X on my '72 Challenger Rallye. With this code, there is a possible delete, in my case my car didn't get the side front fender louvers and it's a real JS car. Not sure either if it's becuase mine was an early production (8/17/71) and I've seen some Dodge promo pics that look similar to my car, with bodyside mouding but no fender louvers. I dunno.