I remember seeing way back someplace just plain seat rails for a standard beetle. I can't remember where. My '67 has the driver's left (towards the door) seat rail broken, and since the pan has absolutely no rust on it, I really just wanted to replace the rail by itself. (Measure it a few dozen times, break the welds, re-weld a new one in.)
Maybe I will just have to buy the whole front pan section and break the spot welds off and do it that way.