I uploaded a repaired version of the guide, it printed like that once for me too.
The side guide should fit unless your TOM is different than mine. Attach it by hooking on the longer leg first (the one furthest away from the spool), making sure that it is pressed onto the wood fully - no gap left in the notch. Then snap the shorter leg on. It will need to be deflected a bit and
once in place it is not easy to remove.
If you do need to remove it and are having trouble doing so you can use a heat gun to warm up the plastic making it pliable.