This ad is for a 43mm x17mm brake caliper piston specifically manufactured to fit Yamaha opposed twin 43mm calipers. 

High quality Japanese item.

Suitable for:

XS1 / XS2

RD250 B-D 1973-76 TZ250 C-J 1976-82 RD350 A-B 1973-76 TZ350 C-E 1976-78 RD400 C-E 1976-78 SR433C 1973 TX500 1973-74 XS500 1975 SR643B 1973 TX650 A-C 1973-74 XS650 B-C 1976 TX750 A 1973-74

Please see our other ads for the correct seals to suit these pistons and calipers:  http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=160922008038

Or a full caliper rebuild kit:  

We also offer full seal rebuild kits for most calipers, either radial type or traditional.

Check our ebay shop - or just ask. ______________________________________________________________________________________________________