drivetrain.com has the wrong transmission style numbers on their web site. Apparently (from comments I've seen), your best bet is to order the kit by the year of car, and you will get some of the parts you need, but might have to get some specific parts, like bearings, from other sources. The 1-4 synchros are the same from late 1971 to well in to 80s. The 5th gear synchro changed somewhere in there.
There's a few other sites that sell rebuild kits and they also have the wrong transmission numbers. I think that someone created a bad database in the past, it has spread around, and now it's permanent. I've sent a few e-mails to drivetrain.com about the mis-match of year and number, and got replies, but the guy couldn't seem to comprehend what I was telling him.