Are the originals plastic or metal? Dumb question I realize, but I'm too lazy to go look at mine. If my memory serves me (which it seldom does) I think one of mine is cracked which means they must be plastic.
The originals are hard plastic that's why they break by the screw holes . 73 & 74 are alittle more flexable but the hole pattern is different . I make the 68 -72 cover out of fiberglass and they won't break . There cost is $45.00 .