5 would be fantastic, but I can likely get away with just one set, or even just one (R).
The KR637 has really old sliders. They are the same as the 8-2488ALRS sliders in the lower cabinet, but they are completely unmarked other than (L) or (R). One of the right ones in the top box disintegrated seemingly long ago and the rest of them are pretty groddy with some corrosion. Perils of a bondo rich workplace for 30+yrs I would imagine.
Meanwhile, the sliders in the lower cabinet are not only marked, but like new (compared to the uppers anyway). I may swap 4 pairs from there to the upper box after I get done de-grunging both of them... will still need at least a (R) slider to complete.
Thanks for the info and any help with this. After an 18yr hiatus from building cars, kids are grown now and I'm getting back some time and $ to hit it again, hence this purchase. When i say this was "full of tools", I wasn't kidding I'll post some more as I go through it all. I'm not even going to pretend it is going to be as pretty as some of the other projects I've been looking at one here (electrolysis, really?) but it will definitely be a functional work box for me.