I have a 72 240Z i'm swapping the transmission to a F4W71B manual 4 spd transmission. The housing is missing the extension top cover plate (32142-9000). I have had a hard time sourcing this part. Does anyone know a shop that rebuilds transmissions from salvage parts and may have a case with this hard to find part? I have tried sourcing it overseas, but none of the shops that have it listed claim the part is in stock.