gotta back AstroJim on this ... add the extended cap with purchase, it will match.
buy one from the accessories page ... it will be close, however, not an exact match.
example: the V1 Zombie ... the extended caps have the exact matching red splatter when bought with device (meaning, that cap is the exact cap for that ProVari).
buy one from the accessories page ... the paint splatter will not be an exact match.
apply this theory to all extended caps when ordering