The top light is not used for refractometer readings so no problem there. Replacement would be a white frosted glass disc. The "yellow filter" used for the refractometer readings is of more importance.
The top lens is not important. What is important is the orange lens which sounds like its OK. I would not pay more than about $50.00 for one of these. It is essentially a Christmas tree light with three filters only one of which is worth any money. The orange interference filter. They can be bought these days on ebay for $20 or $30 .
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