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S&S #177 Air Cleaner Backing Plate--S&S Super B, Only!
The #177 backing plate is specific to the S&S Super B, and it has a front-to-rear mount hole spacing that is approximately 1/4" shorter when compared to the Super E and Super G air cleaner assemblies. So, for Super E or G applications, this plate will not work. For E/G applications, you'll need to find a #330, #336, or #380 series plate.
Super B, only.
091021 CR-3 (21 08 29, 4-1)