Piston Ring Set - 1st. Oversize - 0.25mm. (for 1 piston) Fits: TX/XS650's 74-84 (447 & 533 type engines - 1974-84). OEM Ref.# 447-11636-01 Quality Made in Japan on all new tooling. Note: 447 type rings interchange with European 533 rings but pistons do not. 447 rings do not interchange with original 256 rings used on 1970-73 models.