Last fall I took the rear wheel, from my "83" 1100E, & a new tire to a local, private, shop to have the tire mounted & balanced. We discussed the tube vs tubeless wheel thing. He said he didn't recommend putting the new tire on this wheel, as it didn't have tubeless stamped on it, without a tube. After quite a bit of discussion I "thought" we decided he was going to mount it tubeless. I noticed, the other day, the bike is sitting the garage with a flat rear tire. A closer look & I see it has a tube in it. I'm not happy. This time, when the tire goes back on, there "WILL NOT" be a tube in it. Back in the "80"'s, when this all started, our local shop had the tubeless valve stems, on the shelf, that bolted right in to the existing hole, no problem. Now I'm seeing to countersink the hole, drill out the hole, bevel the hole. I'm just looking for a stem, like my old dealer had. They are the 0.453" size, but is there a specific brand, or model # that is known to bolts right in & not need drilling or modifying. I found in an old thread, Bike Master # 15-1947, but that one is no longer available. Probably most will work, but one that someone has used & knows works well may save me a little grief. Thanks.