Gearbox is out on it's the mother of all jobs (for me).
Core you caught me right as I didn't fully study your blog. However both selectors in your picture are for a c514 whereas mine is different. Later on I will post pictures of the apocalyptic gearbox.
Now I need to start thinking of sourcing parts

In theory, all you`ll need is a replacement gearbox casing & a diff, thats assuming nothing else got wrecked while there were broken bits of whatever spinning around inside..

Its obviously infinitely easier to locate a complete box & swap it rather than start dismantling & repairing it, in fact its probably marginally easier to fit the later C514 box & change mech, & they should be much easier to find, but thats up to you & Core!

Here was my write up when mine went:

https://www.fiatforum.com/uno/265409-tranny-issue.html

Here are some pictures

Any Mk1/MK2 Fiat Punto box (C514) should fit. I've sourced a few this past year and they are easy enough (and cheap enough) to get hold of. The trick will be to modify the gear mechanism.

nunesaf said:

Here are some pictures

Click to expand...

Wow, so it looks like it completely lost the 2 planet gears & the spindle they go on.. God knows what caused that, & not surprising they exploded the casing.. Lucky you wernt going fast, that could have been very serious indeed.