Description Necessary part to hold the shift lever in place when adjusting the alignment in your shift linkage.   When you climb under the van you can look from behind the clamshell up into the shift box. There are metal tabs welded inside the box to limit the movement of the shifter. You need to put this 23 mm spacer between the shifter “finger” and the tab on the passenger side. Then move back and tighten the clamp with that 23 mm gap held in place. Good to go.