3 piece system, 1986 325i cabrio.
Couple of years ago, had an issue with the centre section, was replaced for an item from ECP. The OEM back box was maintained.
Over the last few months, backbox was on its last legs, as such purchased a Bosal item.

Item 247-981 from here.
All the other bits, brackets/joining things were bought from BMW.
Anyway, my Dad took it to the local mechanic to get it fitted (unfortunately I had work commitments) and they stated they couldn't get it to fit!
I wasn't there at the time but the (second hand) feedback I got was that the bores were different sizes and didn't match up (or something like that).
This is a decent mechanic I've used before so I have no reason to believe they were lying.
As a desperate measure, my dad told them to get a backbox from ECP (which I hate - not particularly good quality at all tbh) and that managed to fit ok.
As such, I now have a ECP centre and back section on the car and a Bosal backbox sitting in the hallway.
Can anyone shed some light or have any experience with this Bosal part? It seems to be the correct item for the car, I don't see why it didn't fit.
Any advice/opinions very much appreciated.


