King top cap washer, P/N SP01954, 3/4 x 3/8 x 3/32, fits many, including TR700, set of 3
Bach Stradivarius top cap bumper, P/N 30023Z, 11/16 x 3/8 x 1/8, also fits TR500, set of 3.
Bach TR300H2 top cap spacer, P/N TR50070, 11/16 x 7/16 x 3/32, set of 3.
Bach Mercedes, FH200, TR300H, & others, P/N B2547Z, 3/4 x 7/16 x 1/8, set of 3.
Bach, Conn, & King, low brass, top cap felt washer, 7/8 x 9/16 x 1/16, set of 3.
Conn Tuba, top cap felt, 7/8 x 7/16 x 3/32, set of 3.
Contact me if you would like to verify your horns fit.