I'll answer for him: Yes.5+ years ago...they were all over the net; now you'll have to call Forks..(carry a fourleaf clover in your shoe for a month) and Explorers...and have them rummage around in their drawers ( er...The Side Lightning (and the later Lightning) have their roots in the old Gladstone part.
Thanks, I haven’t tried forks though I did try Explorers with no luck (by the way KC is an obscure place to find really great vintage gear). I also called Rupps LoDo drumguy, and other Denver area shops. And no such luck :( but now I know what to look for, also, I have Tim from Drumcity on the case as well.
Might I ask what is Gladstone?