Possibly muffler bearings?


"FREE SAMPLE"

I have two Federal-Mogul (Bower/BCA)  bearings that I picked up from a friend who couldn't tell me what they are for except he bought them in regard to a 57 Bird.  Numbers are B-3218 (YIA) and M-2418161-X1. (Y5A)  They are not wheel bearings as far as I know.  Any one have a chart that would tell me what they are for? 
The  M-24161 is about 15/16 wide, 1 3/4 outside diameter, 1 1/2 inside diameter  and closed on one side (like a cap)
The B 3218 is about the same width,, 2 1/4 outer diameter and 2 inner diameter.

Thanks


54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ