Has anybody used one of these on a disc brake conversion?How do you remove the plastic resevoir?The one I was looking at using leaned back on the firewall, so was wanting to use a different res. from a flat firewall vehicle, or do reman one's come with the res. mounted? I was looking at using one off of an 84 Caprice which has a bore of about 1.6 " on the booster end.I have an 84 S10 one that measerses 1.45 " at booster and has flat firewall resevoir. I think the smaller one is big enough , compared to the size of the origional, 1957 buick, but maybe not?Any advise would be helpfull, and I have already read all the tech advise at MPBRAKES which has also helped some.