The 66's did not come with the snap on feet. They came with the solid hinged ones.
Is there a reason you want to go with the snap on feet? The original types are still available.
However, as I understand back in the 70s or perhaps earlier Singer came out with the snap on feet with the narrow ankle. Then some time later the wide ankle ones came out and now every one uses that style.
The wider ones are better in my opinion based on my experience because they don't wobble and twist like the old style ones with the thin ankle.
In actually I have quite a few machines, and I'm replacing all the snap ons with solid feet as I can. The solid feet work better for me.
If you really want snap on feet, I'd suggest the wide universal one. Either will fit and work on the 66 but like I said, the wider ones work better. And you can buy feet to fit the wide adapters just about anywhere.
Joe
Last edited by J Miller; 07-14-2012 at 07:28 AM.