Plastic window replacement

[slogans7]

Well, with both crow and foot firmly in mouth after commenting that the rear window on a 2002 shouldn't crack, I cracked mine by doing the Boxster chop when it was too cold. It's not too big but will spread, of course.

I could just go cheap and put some tape or something over it but would prefer replacing the thing. I know a local shop that did the same job on a Miata and 325ic of mine, but I need to get the plastic. Anybody know any good sources that'll have the right plastic in the right shape? I seem to remember someone suggesting to check with places that do tops for boats...

And I don't want to put on a whole new top with glass window.