In 74 or 75, I don't remember which anymore, my friends mint 71 SS 433 was hit by a car. We ordered a new chassis from Yamaha and I got the brainwave to get an SR chassis. It came no problem and we switched everything over including a brand new seat. He rode it a little, then left town for awhile. Next I saw him, I inquired about the sled and he told me that he sold it! I have wondered about the where abouts of the sled ever since and kicked myself in the *** for letting it slip through my fingers! G.