plus they are pretty inexpensive. last set I bought were about $20 each new and some even come with new copper washers. 1980 Aspen/Volare is a good one to get.
Do check the boxes to make sure you get a left and right, dont trust the labels.
Yeah I always check the boxes before I leave, never know anymore. Left, right, the actual part you wanted in the box, and with calipers making sure the pistons are the same material too since they have metal or phenolic pistons.
FYI, the Aspen/Volare calipers will have the larger 2.75" pistons. It's a nice little braking upgrade, but, keep in mind it will change the pedal feel a little too.