The 1.5mmX6mm vials sold at candlepower by Merkava at http://www.cpfmarketplace.com/mp/sho...d.php?t=170374 are the exact diameter of the Yugo front sight vial. Cheaper, too and you don't need to disassemble anything.
That said, I ordered one on January 3 and haven't yet received it. I'm not worried or complaining (not yet!), just advising patience. I'll post a short report if/when I get my vial.
Yugo RPK kits $199