Bought and installed blue window tint on side windows of my '55 Chevy gasser. Reviewed on youtube how to heat shrink to shape. I couldn't make it work. Have gone to 3 tint companies and they say they will have to install as 3 parts because of curve on sides. I'm not liking having any seams. I've seen several pics of 55-57 chevy gassers with rear window tinted and it doesn't look like any seams. Got any feedback?