[quote=Diplomat360]CompCams #529-16 here. They are setup for 0.530" valve guide diameter and 11/32 valve stem. Looks like the VITON seal material is "placed/formed" around core metal jacket.

These seals worked great for me, I went from the hard Teflon pieces to these and whatever seal pass-through oil consumption I had has stopped.

Oh, one thing that helped me, these are a tight fit, so I also picked up an install tool, CompCams #5334, installs .500, .531 in. PTFE Seals, etc.

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You are correct for .530" guide 529-16 not 503-16
Doug