I would say that you will need to match the mounts to whatever U brake you have.
On an unrelated subject - I see you're from farnborough, and have a white Avalanche. Would it be the one that was on ebay until this morning ?? I sent you a message about it if you are the same guy.
Have a XT U-Brake and the one from the Avalanche, might be a stupid question but can you remove the mounts?
Yes, they were on eBay and posted an ad on here, but have no time to post and made that clear on the auction but got a load of questions on if I could post. Have a mate that is kindly storing my bikes and projects while I move so will probably put them up for sale again once in the new house (thinking about repainting the forks from the avalanche and using them on the Zaskar now though).
'89 Saracen Trekker x 2 / '89 Saracen Trekker Comp
'89 Saracen KiliFlyer x 2 / '90 Saracen Trekker Comp
'89 Saracen Traverse / '90 Saracen Traverse
'91 Zaskar / '97 Zaskar LE / '05 GT Avalanche 1.0