ive only seen one 4 spd with the 203 behind it it was in a 73 f150 with a 460, i have a np435 with 205 and both length c6 with 203 and 205 just wondering if the adapter from np435 to 205 could be used for a 203 for a doubler application using the granny gear tranny or if anyone has seen a factory 435 to 203 adapter or if my spare c6 stuff might be used ?