timbo Autotecnica make a few different Volvo boss kits, they are available locally plus have both common steering wheel bolt patterns on them
IIRC the Autotecnica one is solid aluminium (or zinc?) die cast...the nice thing about the Momo one is it has the collapsable steel strap design. Probably not a huge deal. Also as mentioned previously, the indicator cancellation feature on the Momo adapter isn't too good but can be easily improved. I can't recall what the Autotecnica one is like in that respect.