I just got through installing a set of carb dia from JBM and I don't know if they hold up but they sure look great and were easy to install,fit like they were made for it (Oh yea They were) I'm sure someone has used these before, but for those of us that were in the dark is why I'm posting this. I think everybody should be aware I think there the greatest thing since sliced bread! Well that may be stretching a bit but there still great