Spool mount brackets

I have here a crusty set of spool mount brackets for sale. I got these in a bucket of parts that came with a pair of 360's/727 I bought. I do not know exactly what they fit but someone here probably does. (If you know for certain, please respond to help all of us!) The RH and LH marker writing on them was there when I got them. Obviously the rubber inner actual mount requires refurbishment but the brackets are otherwise in decent shape (other than the crud!!). (That's a regular-sized paper plate they are sitting on.)

$30 plus shipping.

20220912_213334.jpg 20220912_213501.jpg 20220912_213539.jpg 20220912_213608.jpg 20220912_213640.jpg