Need sprockets for a Komatsu D135A-2, where to get it?

Hi guys, I need a set (2) of Sprockets for a 93 Komatsu D135A-2 Dozer, OEM part# 15A-27-11180(14) and 15A-27-11190(2), where can I get a replacement for this, No luck with komatsu and berco this sprocket are on back order on both places. Can you guys please point me in the right way of were I can get this.
Thanks

Need sprockets for a Komatsu D135A-2, where to get it?