Yes, there is a locating tab, but only on one half. The other half cannot have the tab. Washers are the same for all TR2-TR4A. Sorry I don't have a good photo, but here is part of the diagram from the parts cataloge.
Personally, I have a hard time seeing a bronze alloy as being better in this application. The stock thrust washers are the same tri-metal design as used for rod and main bearings. That design has been around for a very long time and is still in use today (although most makers have gone to cheaper materials that aren't as good but "good enough"). The TR6 motor does have a problem with thrust washers, apparently a combination of lack of thrust surface (the wet liner 4s have twice as much thrust surface) and a crankshaft that flexes a good deal at high rpm. Kas Kastner once measured something like 5/8" deflection at the flywheel!
But the TR3 motor does not seem to suffer the same issues, and in fact the thrust washers normally outlast the other bearings by a large margin as long as the oil is kept clean. I always change them when doing the main bearings, but they generally are not worn out even when the mains are worn into the copper backing.