hey, i did this but changed the shape to be a bit more like RA. i also made mine out of conveyor belt i bought tractor supply co. it cost me $20 but will last forever. it is 1/8" thick and has a woven core with burly rubber on both sides. i felt it was worth finding a good material that would last me a few years and hold it's shape well. they've been on for 2 weeks now and still look new..
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I know it has been forever since this post but would you happen do have a template for these rear flaps? I'm definitely going over to TSC and picking up that conveyor belt material. It looks so HD.