hi Ron.the flatter ones can also be shift knobs. there were a couple varieties. the suicide knobs are smaller for the stearing wheel, and usually not glass. mostly catalin or bakelite. what is confusing is there are also glas finials for the smokers stands that look like shift knobs. but are usually a translucent glass base, although not always, a bit smaller, and the threading is differest as well. the new ones are made in china.. sorry sue.lol'I had this picture on file from a discussion on the akro ashtrays... but you can see a few of the gear shift knobs.. hope this helps a little.