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I find most autoparts store caps are thinner material than the stock ones which are hard and thick. So a little smaller, coupled with a bit more supple rubber, should stay on nicely.

This is probably the dirtiest post I have written so far.



Well the ones I bought have walls that are nice and thick...just like a good steak. In fact, comparing them side by side, you can't tell the difference without looking at the openings. The rubber material is just as hard too.