CRAFTSMAN VERSATRACK Universal Snap in Bracket

CRAFTSMAN VERSATRACK Universal Snap in Bracket.  Press to snap in place.  Includes Hole(s) for mounting. I printed them in PETG.  There are 2 variants, one with a center Hole, and one with 2 symmetric holes.  

Each attachment hole has the following counterbore measurement: Size M3.5
- 0.315 in bore, 0.1 in deep.

- 0.154 in (3.9mm) hole

There is a locking screw sized for M4 bolt.

https://www.craftsman.com/en-us/product/cmst82602vt/craftsman-versatrack-4-foot-storage-rail