Two kind of Felpro head gasket set for 97 3.8L windstar The only difference is One has 3mm thick lower intake gasket another's is 4 mm Who know which one should I buy for it?

I found this online:

I discovered yesterday that this 3.8l has 2 different intake gasket thickness's 3 or 4mm. I found thru here that intake gasket failure was common on the 3.8l. They saided that they improved the gasket making it thicker.

So I'm gonna go ahead with the 4mm. Let us know how it went for you.