Summary

I bought some silicone spacers to replace the springs on my CR-10, and the vendor pointed at this design.

Seems they used to offer a version that allowed you to insert spacers of your own design, but have since replaced it with a solid plastic piece, joined to the cable strain relief where you would otherwise place your 16mm spacer on the upper left corner.

Remix puts this gap back for those like me, who need it to gone.
Hole measures as deep as it needed to be to make same height as prints plastic spacers and centered to the hole on the bottom.

Tested - Works. the shorter piece sits level with the stand alone spacers, and installs perfectly with the ABL.

Can't believe I'm taking those huge adjustment wheels off. I think they were my first print :D