Mike,
I got it from Texas Air salvage, but couldn't find the receipt. It doesn't look like they have any, but I looked them up on the Aircraft Spruce website. It's the 5" skull cap spinner and they have a picture of the bracket there as well. They have them broken down by engine type and size. With the mounting bracket it was $56.50, $41.75 without it. I would be happy to send you the bracket (Free), but you may be better off getting the whole assembly.
Pete
Pete Burns
Happy owner of a 1946 Aeronca Champ 7AC
Sad ex owner of a 1967 150G
North Creek, NY 0NY0 (Bennett's Field)
States I have landed the 150 and or The Champ