I need to alter (cut or something) my kick panels so I can put some speakers in there. Is it easy to cut these, or if I do will they warp and just easier to buy some that are made with the holes in them?

Also, I wanted to put a tach of some sort in my '71 SS, so was going to put a repro '71-style tach in the cluster. However, even though it isn't correct, I really like the '69 tach gauge that has the little gauges next to it, all in the same pod. Would this fit in my '71 dash/gauge cluster?

Thanks.