Well after being all happy & smug the boss kit arrived & does'nt fit, even though it's a mountney classic & is listed as fitting a fiat 126.

The splines on the boss are to big to fit the finer splines on my 91 BIS hub.
I'm now left with a boss that does'nt fit & a hastily bought mountney leather wheel (should have known better)
So, the original question remains, how on earth do I fit a mountney classic steering wheel to a BIS?
Other BIS owners, what boss kit do you have on your car if you've got an aftermarket steering wheel? I've trawled past posts
but I'm still none the wiser. I understand I may have to buy a smaller momo style boss kit (& subsequent steering wheel to fit) which makes of these definetly fit the BIS?
Help much appreciated.

Dave.