FWIW, just a quick update ... Lil_Mic's right with the Autotecnica part number.
I finally splashed out and blew my budget for the week but getting a 5mm spacer. This meant having to get a Momo steering wheel however I was able to retain the Autotecnica boss - testimony as to its great value being able to fit all sorts of steering wheels. I believe that it's $80 price is good value considering Momo boss kits probably go for over $100 and can only fit their own brand wheels.
Not sure about the SAAS ones but I'd assume that they also have drillings to fit Momo as well.