SOURCE: I was given an edu science astrolon 525 power
You can buy a diagonal and finder-scope from many on-line retailers. You may need a .965 inch diagonal. Measure the hole in the back end of the telescope.
Diagonals are made in 3 sizes.... .965, 1.25, and 2 inch sizes.
Here are two retailers-
http://www.agenaastro.com/
http://www.optcorp.com/
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