You can't put 16 inch frames in a 210. The later 210A was modified to a 34 inch overall width to make room for the new 16 inch frames. These are early 210's at 32-1/2 overall width. Early style 515's with split rims nearly touch each other as well as the outside walls when mounted on the baffle.
Got any 150-4/150-4C's, or D-140's AA?
Find you some Elmer's "Stix-all". It's silicone based, but sets up a little firmer and stronger than typical silicone.
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