SB Cam Thrust Plate P5249637 no longer made? Only tensioner now?

Duane said

So you are saying the plastic is not wide enough for a double roller.
I did not think strength had anything to do with it. I thought it was to keep the slack that all chain eventually get, from disrupting the cam timing.

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You're correct. A double roller will stretch less because of it's strength. As the chain wears and stretches the cam timing will change whether it has a tensioner or not and yes the tensioner guides are not as wide as a double roller chain. You can use one if you like. It will work as designed. I just don't think I will use one again for the above reasons.