Give andrews a bell, considering they do the GSO branded equipment, they should be able to sort you out.
I was looking into this a while back, where somebody was selling a red dot finder, problem was it had no base to attach it to a scope so i didn't buy it, though now i know you can pick them up for 10 bucks, and they are exactly the same as the ones on the skywatcher for the finderscope.
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