sorry not hubs but drums. I got a load of parts with my new toy. One of the brake drums has cutaways (openings) in the center. like pie cuts kinda looks like the steering wheel in shape. IT has a brake shoe surface and is tapered. looks just like a regular drum besides the cut aways. are these normal items? agian i am a newbie also when i put the rad in today it hits the engine crank handle loop before it sets flat on the frame, i asume their is a pad underneath the mounting points or is the rad I have for a 30 31. thanks