I'm getting ready to put in a bigger cam (solid roller), and I thought I'd upgrade my current cam thrust setup. Right now I have a steel timing cover with a thick washer welded onto it so it fills up the space between the timing cover and the water pump housing. On the end of the cam I have a Comp Cams nylon button that I've ground just a bit to achieve cam endplay. I want to do something more substantial and less hokey, so I bought an Indy cast front cover and now need to select a button. I'd like to use something rollerized, just because that looks like a trick setup. I see that some come with shims to get the correct endplay. What do you guys use?

I use the nylon ones. I've had the roller ones let the little bearings into the oil pump,,,NOT good!!

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I bought an Indy cast front cover

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Don't know WTF they were thinking when they designed that POS ... they don't fit under a stock or aftermarket aluminum water pump!!

Nothing wrong with nylon buttons and nothing wrong with your current setup - especially if you already have the proper clearance.