For your engine, there is pretty much just ONE verion available for the 3 guide rails - solid plastic.
You MIGHT get lucky and find an aluminum-backed one from a 3.5 on eBay. I MIGHT have one or two in my garage. Problem with these is I don't know if you can get the hard plastic (rubber?) to resurface them - but they wont ever crack.

There is a reason I used 3 vice grips. At all times, there must be at least 1 of them holding each end of the chain to the sprocket. If you make sure of this, and you go slowly and steadily, you will have no problems putting your chain on. Even if you do skip a tooth on the cam, it's easy enough to fix when you get to the end.

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Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k