I have been a lurker on here for a while and some of the info has been very helpful. I have owned my 100HP for 12 years. It has failed it's MOT for rear axle excessively corroded. Picture attached.
So just resurrecting this thread and adding my info.
Been trying to find a replacement and finding the same issues as others. Found this thread, and pretty much everything has been covered.
Some from my investigations, the aftermarket axles cater for drum brakes and some say also Disc brake vehicle. The fixing of the drum or disc stub is the same fixing. The 2 issues I have established the cut out for the ABS sensor at the top for a disc vehicle, on the side for a drum vehicle, and the bracket for the brake flexible from axle to disc calliper. Some aftermarket axles do not even have a cut out for any ABS sensor.
On speaking with my local Fiat Dealer, Fiat no longer supply the rear axle, however would be over £1000 to purchase if they did have available
They have however confirmed, which seems to not agree with the evidence.
51856918 will fit all Panda's apart from 4x4 and 51856917 will fit all Panda's apart from 4x4.
But looking it does appear a drum braked vehicle there are differences., as highlighted. ABS sensor cut out and bracket for brake flexible. And then also aftermarket may not have the fixing for the ABS lead up the axle but you could just cable tie that.
Dimensionally all aftermarket axles will fit a 100HP, but you will have to modify to cater for the above.
I have contacted my MOT station and asked, if I can get the rear offside welded. They responded if it is professionally welded, they would consider that and allow a pass. So I am going down that route as I type this.
Suspension pan is being repaired and re-enforced, and hopefully this is acceptable for the MOT station.
It may be accepted for this year but need to get a replacement axle. My idea is source the best one, and probably run a flexible from the body all the way up the axle to the calliper, then just need to cut a hole in the plate for the ABS sensor.
I hope this helps anyone else in this situation.