[Pretzel]

While a drawer slide makes it sound as though this is a part you purchased that you didn't fabricate yourself, I just felt the need to step in and clarify. If it a "pre-fabricated" in the sense that you bought it from a store or retailer, it is considered a COTS (common off the shelf) part and it legal.
If it is a part that you fabricated BEFORE the build season, being "pre-fabricated" in that sense, then it is not legal. In addition, you may not fabricated another part identical to something produced during the off-season unless you had previously made public those designs. This is to prevent teams from essentially building an entire drivetrain that they will use in competition before the season even starts. You are however allowed to tweak a design that your team worked on during the offseason provided that your competition bot's parts were entirely created or assembled within the build season and you didn't make a carbon copy of what you produced In the offseason.