I did not get the back and side stops as my press is fairly close to a wall and I do all one off stuff. I may do it five times but its still one off with four Aw ####s
I think the 60 deg angle is important for gettin in excess of 90 deg of bend to allow for spring back and also to keep the radius of the bend tight as possible. I priced just the steel for a top die and it was $80.00 and thats when I decided to fo with the kit, I also neeeded to buy all the rest of the 1/4 inch steel, round bar and springs which added up to more then The pre fabbed kit cost me.