Just Google them. Go to the sight and you can put in the dementions and material you want to use. It has been a little while since I used them but I bet it will be under a buck a piece.
Mine is a 72 dart. It had a /6 now a 340 with a champion 3 core radiator. I have the new hayden clutch and it gives me a little over a 1/2 inch. I also have a motor mount swap kit not sure what brand. I hope that helps