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I agree That Painted flames are the best way to go, I notice this link
http://www.flameit.com has masking kits also, that you can place on your car and paint the flames, giving you the pro look and your color choice...also looks like they offer alot of cool other stuff for the PT..cool stuff for a hotrod shop..
flame on..
http://www.hotrodworks.net/decal/ptcruz.html