Starting with the /6 models, all US bikes (except for odd-balls like the R65, R45, etc) excepting the flagship RS and RT models had the ignition switch in the "bucket". Also, the R65/45 headlight and instrument mounts are totally different than those of the larger bike. So, if it is as you say and your left and right headlight "ears" are individual pieces then it appears you have some sort of Frankenbike (not necessarily a bad thing) and without some pics it's gonna be a bit hard to help you figure out just exactly what is going on. No homework needed to post a pic, if you have one on your computer you just browse to it in the ATTACH: line and click.
This is what the headlight on a standard 1981 R100T looks like:
Note the headlight, switch location, headlight mounting ears, etc. If this looks like yours then you have numerous parts from one of the "bigger" bikes on yours.