SB Rod part #'s query

Thanks to everyone who replied - i have the answer now! I think lilcuda summed it up the best: Nothing written is what you will get 100% of the time. But at least i know that the 645 is classed as a HD rod, and that plenty of 318 had them (especially later ones). Special thanks to 2 Darts for making that list which i have cut and pasted into my Info.