I purchased this to replace the counter belt on my 1976 AKAI GXC-39D cassette. The service manual listed the belt as part# MB456660 Capstan belt D106 x 1.4 x 1.4.(assumed it meant Millimeters)(approx 4in. My actual Measurement of the old belt was closer to 12. The 13.3 replacement was perfect.

This item is listed as compatible with the Akai GXC-505D. I installed this item in an Akai GXC-510D together with the SBM_4.8 and the SBO_7.0 belts four days ago. Although they do not match exactly to the original belts, all three belts are working correctly and the tape deck is now fully functional. (Not bad for a 50 year old tape deck - Akai sure knew how to build them, and all with discrete components - not an IC in sight). According to Akai's Spare Parts Manual the following models all use the same belts: GXC-500; GXC-500D; GXC-502D; GXC-505D; and GXC-510D. If you need belts for one of these Akai tape decks I would recommend these belts as a good alternative to the originals.

Perfect! Didn't even have to adjust the pots for speed control. So happy to have this 1974 relic working again. (AKAI GXC-510D) Thanks for the sticker too!