Cast aluminum plates are had anodized and are available in two sizes. One plate isused for 1.5" and 2.5" storz adapters. The other plate is used for 4" and 5" storz adapters.

Part #584810100  1.5" to 2.5"  Storz mounting bracket
Part #584810110  4" to 5"  Storz mounting bracket
Part #584810120  4" Storz mounting bracket
Part #584810140  5" Storz mounting bracket