The seals may be the same size, but they are of different thicknesses. I am re ringing my pistons right now, a few tips that I just learned: Get rings from PP, they work the best and are worth every penny. Have your cylinders honed at a machine shop before ringing your pistons (I tried to do it my self and the bit cost more than having the shop do it). Check rings for proper gap in honed cylinders. Clean the heck out of the pistons, and ring grooves. If you need used 1.7 or 2.0 pistons and cylinders let me know. You must replace two adjacent ones at a time at least so that they remain ballanced. I may have some left over seals that I ordered and didnt need as they were included in a kit that I also ordered. Just my humble $.02. Good luck
-Mike