BASE LENGTH HOLESPACING DIAMETER THICKNESS PROFILE SCREW SIZE
46 1.168 0.86 1.29 0.222 D 6-48x.194
55 0.812 0.504 1.05 0.31 D 6-48x.219
Bit hard to read sorry
Hole spacing is meant to be 46 = 0.86", 55 = 0.504"
From a chart about 10 years old but still should be the goods.
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