I am putting an ST185 box into an ST165 and only the Left Hand drive shaft (ST165) fits into the ST185 box...!
The Right hand drive shaft (ST165) is too large in diameter, (where the outside seal sits once in the installed position), to fit into the ST185 box.
Has anyone else found this?
I guess I will need a right hand ST185 drive shaft...?!

Can't always believe what you read online then I guess if this is the case.
The ST165 I am working on is one of the early versions 1986.
Any imput welcome.