Many period Renaults had rear engines, the Europa had a “mid-engine” so they have different directions of output shaft rotation. R17s are a good source as they had the engine in front of the transaxle unlike the R16. With the arrival of the R17, Renault no longer had to modify the boxes to suit the Europa. Unfortunately that meant we were stuck with the 3.7x diff rather than the 3.56 of the modified boxes. So the 352, 395 and 365 boxes from the R17/15 can be used in a Europa with just the change of output shafts being the only required mod.