Where can I find South Park replacement target assembly part number 500-6075-11R. They are the set of three rear mounted round stationary targets located next to the Cartman hole on the right side middle of the playfield. If these are only available used can anyone suggest a compatible replacement? Perhaps one of the front mount targets that can be reversed and if so where can I buy that? I still have the original fluorescent green target intact, just the black plastic housing broke. I considered trying to superglue the housing back together but figured it would not hold.