I don't have an 1800, was trying to help out but I couldn't figure out where to find them on a parts fiche! Spent 20 minutes checking everywhere I thought they might be. Out of curiosity, anywhere know how/where they are listed? Would probably be listed for the 1300 the same.
If they work with the 1800 as well, there are OEM 1300's that I ordered online. They weren't too expensive ($20+ shipping), but they weren't chrome. I haven't put them on yet, but they are sitting in my new parts bin to go on some day in the future.