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Interesting, mine has an o-ring fitted under the head of the cap/plug, but there isn't a face or radial groove for it to sit in. It sort just gets squished between the head of the cap/plug and the aluminum frame. Should I take it off?

Well the cap itself is fine, I just wanted to order a new o-ring from McMaster if someone knew the dimensions off hand. My calipers are in storage, but I'll figure it out.

I have an older MX (0035) with the plastic coolant cap.

Does anyone know what size and material the o-ring is that's used on the coolant cap? Mine is all cracked around the edges.