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

Kendog 170 said

I am out of my league here but doesn't the cupped washer on the cam bolt control the movement as well. When I tore down my motor, someone must have lost it and used a flat washer. Cam had crazy in /out play until I replaced it with proper washer then play was in spec. somehow cam was unaffected.

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Mopar performance used to sell a high strength cup washer for that because the stock ones used to collapse. So yes yours may have came loose.
No the washer does not control the end play. It merely secures the came gear to the came. The end play is control by the machining of the three components combined. The end play is probably just so oil can get between the parts.