Engine trouble

[Mattcheese31]

Matts in the ball, checked my aux belt, there is a chunk missing and a fraud but, guess they got mashed together

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Auxilary belt/serpentine belt/fanbelt, no need to replace it tbh unless its worn. btw theres 2 different timing belt kits the back plate on the idler pulley is the difference between the 2.

So which one am I gunna need? And what am I looking for too tell the difference? What does the back plate look like? Are the belts themselves the same? If so might just replace the belt for time being till I can affor to do the whole hog

I most certainly am not in the ball, or in any way living inside a testicle