i need help please

i have a 1981 z28 i need help decoding on the body badge i have a code 15v for interior can anyone please tell me what it means i know 15r and 15n but no info on 15 v

the camaro white book only shows 15 c, n and r.  i dont see any other rpo codes with a 15 and the letter v.  i checked the year before and after and neither used 15 as a interior designator. id check some of the data plate and rpo websites. (pic??)  would be interesting to see. might be an irregular data plate or a strange new world    let us know   kurt