The last time I bought new sprockets for my DR I noticed they are made in Thailand by JT Sprockets (jtsprockets.com). Whether they are sold here I don't know, but they list sprockets for just about any bike, so may be worth a try. I'll try the local big bike store this afternoon. (Don't now whether this has been posted before, but the Search function seems unable to search for strings with spaces in them. So apologies if this is a dupe.) For my DR650SE the gearing choices are too limited for me, but by changing chain size to 520 the choice more than doubles, but you need to know what you are looking for, as they don't list that as a choice.