Patience and ebay. I have 5 Hondamatics, finding a good stock exhaust, affordably, is a task in itself. I went aftermarket for mine. You can find the headlight bucket, fork ears and turn signals on ebay as well. There are a few differences between the k series and the a series but thy will work. Caution: A 76' Hondamatic has a different frame and wire harness (The plug in for the gauges is different) Exhaust was a 4 into 1 versus the 4-2 on the later bikes. Early 77's have spoke wheels vs. comstars however everything else is interchangeable. If you do an original resto, Be sure its right before you buy it...
PM me if you have trouble, I do have a few spare parts just not the headlight hardware