I'm not sure what requisite lugs you're talking about.
I do have first hand experience with some lock stuff from ebay, although since it's been a number of years since I messed with them. I'm not sure if what's available now is the same stuff that was available six or seven years ago, but back when I was doing my locks, the only locks that were being produced new were door locks and ignition locks and I they were being made in Taiwan (by ASP). I've never seen any new production for glove box or hatch locks. So back when I was doing all my locks, I purchased door locks and ignition lock stuff from ebay.
Be aware, however, that there are a couple different gotchas... First of which is that the really early cars used single sided keys and all that lock stuff is very different than what was used on the later cars. I don't know what constitutes "early" and "late" exactly, but I can guarantee that my 77 is "later" and I have absolutely no experience with the early single sided key stuff. I don't know if that's a 69-70 thing, or what.
Second possible gotcha is the key blank as there were a couple different blanks used (at least in the later years). By the time they got to 77 there were two blanks available which were a mirror image of each other. I'm not positive, but I believe this practice started in 74 with the 260.
The third gotcha is the length of the ignition cylinder and the number of tumblers included within. By the time they got to 77, the ignition locks used seven tumblers. But some year prior to that, the ignition locks only used six tumblers. So I'm not exactly sure on what year the change went into place, but at some point, they upped the number of tumblers from six to seven. I haven't researched it, but I believe all the door locks used six tumblers even into the later years.
The last gotcha is that the actuation arms on the 77-78 door locks are different than previous years and most of the ebay door locks won't work. I did a quick check and there was at least one seller that had stuff that was 77-78 specific, but the point is, if you're looking for 77-78 stuff (which I know you are not), you have one extra hurdle to overcome.
So the summary is.... If you're going to buy lock stuff off ebay, make sure it uses the correct (mirror) blank. And if it's an ignition lock you're buying, make sure it has the appropriate number of tumblers (six or seven - also referred to as "short" or "long" body). And if you're looking for door locks for 77-78, make sure you get the ones with the correct actuator arm.
Wow. Lots of words. Sorry.