[urq] gearbox

[Patrick Carlier]

I've got an 1981 ur-q under restauration . 
I've bought the car without engine and gearbox . 
Stock gearbox was an UG 5 speed gearbox with 
35/9 FDR  . 

The local wrecker has a six speed  gearbox from an S4 
and wants 350$ for it . Now this is a gearbox 
with 37/9 FDR . 

I think I can put  this six speed in the car , on condition that I change the rear diff to 37/9 .
 
The only problem is that I don't have the stock gearbox , so I can't compare 
it's dimensions to the six speed . And I don't want to end up with a six speed 
that doesn't match the driveshafts and or shifting mechanism . 

If somebody has ever done this swap , any comment appreciated . 
Or  if someone has a stock box lying around , and could take 
some measurements  that would help to . 

Pat