Hi and welcome to just answer.
do you have the 5 or 6 speed box fitted.
thanks for the info .
according to my data you have a limited slip diff fitted but there are two types and is important to identify what type you have .
you can identify this by looking at the drive shaft flanges (they have different size splines)
TOCHIGI FUJI SUPER LSD is the type of diff you have fitted ignore the previous reference so will have to replace like for like.