Both sides of the replacement drawer glides need to clear, plus the drawer suspension height has to be exact. It's really hard to make it happen. So you need an expert. One thing I would do is search-out a Mac Tools user forum.
Back in those days, the boxes were often just identified by base or top, number of drawers, and sometimes by industry, and sometimes by quality level. Like 7 drawer base. Or 7 drawer mechanic's base professional. They would have a catalog number if they made the catalog. But some of them got sold out of trucks as quick special items. Great tools, but confusing identification of products.
The drawer glides and casters were different for professional boxes. On some boxes the glides were matched to drawer height.
Yep on the lock, good job. That box has all full-width drawers so probably has drawer-height spring loaded rods in walled wells. When unlocked they spring up to level. When locked, the top rod gets pushed down by the cylinder rod, and the bottom of the top rod pushes the spring loaded rods below it down, locking all drawers. There were other locking systems too. But the takeaway is to inspect for missing or damaged lock system bits.
It was not uncommon for guys to weld a locking strap of some sort onto these smaller boxes. Often a flat bar in front of the drawers with hasp for padlock. Fugly, but your jobsite tools were there the next day.
