Bert what kind of CA needs an RB25det box? they are an awful heavy thing!
I was at a car show last week where a turbo Jaguar is using a T5 from an S10 chevy
which is a box I considered for an A series cause they are only 35kg compared to
the 44kg long 72c sr20de silvia box and just over 15kg lighter than the turbo RB

the gearset is anything you want from under the sun for 1095usd and can use an adaptor
plate made to use an automatic ca18de bellhousing