I haqve an old 1978ish sylvan pool and before I bought it the grond must have frozen causing the concrete where the skimmer is to heave and break the skimmer. I have no problem digging the old one out and doing the repairs myself but how do I know which skimmer to buy. It is a gunite pool so Im not crystal clear on how Im going to tie the mouth of the skimmer to the pool I suspect Ill be pouring concrete around it. First I need to figure out the correct part. Can you help me with that. Let me know what you need pictures or whatever.