I've got a K-Line 4-6-2 with the same problem as yours, i.e. a burned out smoke unit. I tried to install a Seuthe smoke unit, the same one that goes in a Williams steamer but it's too big and just won't fit. The K-line unit seems to be closer to HO size.
The next big train show I go to where someone's selling HO parts and accessories I'm going to have a look to see what's available.
By the way, the whistle unit on my 4-6-2 was shot as well. I removed it and installed a Williams electronic steam whistle and bell unit. Easy install and it works great.
I'm looking somewhere I have a guy up in PA that bought a lot of the parts when K-line went belly up but need to check other computer I think he's not far from York in fact.
Life's hard, even harder if your stupid John Wayne
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