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Just got one for my All Weather boyz .. Leupold makes a STD base for the T/C classic .22 You will need the high rings if you have a model with sights and will also have to remove the rear sight. Check google .. you will find the part number. Not lots of them around. Hope that helps!
Since the Leupold rail is listed for a Classic .22 and it fit my R-55, I would imagine that the R-55 Benchmark has the same contour. I have another one on the way for the Benchmark once I pick one up!! The rail was out before the R-55 series was produced.