[BruceLambo]

You may have to make a 'top hat' spigot bearing. Ive done this on other engine/renault conversons and it works fine. Some gearboxes dont run in a spigot bearing - I had a Nissan N1 close ratio box out the other day and it doesnt run in a bearing. Mind you the shaft is short, so there is not as much loading on the bearing. The Renault inputshaft bearing is quite small, and would be better run in a spigot bearing.
To find out what kind of gearbox you have, there are 2 ways. If it is still there, on the back of the gearbox, on the gearchange housing, down the bottom is a small aluminium disk with a cover bolt through it - on there is stamped the model type.
Next sure way is to look on the back of the crownwheel. Every Renault box has the type engraved onto the back of the crownwheel. If its a UN1 version it will say this eg: UN1-13. Othewise the earlier 369 types have their type printed on the outside edge of the crownwheel as say "369-01" I(I just had a look at one)