I used LP Aero for my co-pilot's door window. I got the thicker plastic, so it needed a 337, a W&B change and a bit of work getting the holes to line up. Also needed quite some trimming on the belt sander to get the oversized blank to fit.
The service manual says (amoung other things) "A damaged window should be saved to provide a pattern for shaping a new window" and then goes on to say "Cut or grind a new window to the same dimensions as the window removed". Since the Piper windows don't need trimmed like the aftermarket ones and it's obvious they are just cut from a flat sheet and are bent slightly during installation (The standard thickness units anyway), I'm wondering if this isn't one of those rare oppertunities to save some real money by cutting Your own. I got a good enough deal on a set from Preffered Air Parts that I went ahead and bought them but You may want to ask Your A&P if he has any problem with that provided it's something You are interested in persuing.
I have been down this road before about cutting your own windows. There is no traceability using "store bought" windows and using them are considered unapproved parts. All windows require an FAA form 8130 to be considered legal... I have in the past used LP, however, since using Great Lakes the initial fit is a lot better requiring a lot less trimming.
