I decided to go ahead and fix them. The pair had an .018 difference in height, which sounds like a lot until you do a little math and find out that with them spread to an outside to outside measurement of 5.9" (maximum on my Viper) that the resultant angle only amounts to .002 across the width (.650) of a ring, well within the range of my lapping bar working on aluminum rings. The resultant tilt should be about 10.5 MOA (down at the front) well within the range of my scope's adjustments. These rings have three advantages. They are well made (except for the height difference), already paid for, and taller than others that are currently available (a little over 1.6", center of scope to top of base), which suits my shooting style. For those that want to get really high, the rings that I just took off are a pair of relatively rare Lee Six external adjustable, that are about 1.9". If anyone is interested in these let me know. At one time I was toying with the idea of combining them with a frozen scope.