I got mine from Libero usa...but I think I got the last one they had...I picked up my engine for $400 and transmission for $200...I got all the electronics (ie. wiring harness, ecu, etc.) from a member of this board who lives in Japan for $350...
I have some extra parts, including an ecu

if you need them...and no the transmission won't bolt up (different bellhousing)
Also if you wanna call up the places that sell SR's they can usually get you a CA...they just don't post it on their webpages (not too many people want CA's

) I'd also try venus auto...that seems to be a common place to get stuff...expect to pay appx. $1500 for a clip and/or motorset...
Sean