RR,
It was me who thought I might need your spacers, as I have the UB.
But Bacillus seems to have shown the way forward and it looks like I'll not need spacers as I have the same Resonated Milltek he's got.
Really fancy an XB now and really must get round to emailing Bruce to discuss options, as I missed out on the group buy, silly boy.
Only XB issue for me will be having to move my amp, which sits attached to the back of the rear seat, sure that's certainly possible though.
Your review has shown me the right path..and it's got two Unibraces on it.