Carb Spacer 4500, 2.125" Sportsman Combo - This spacer set consists of one 4-hole and one open spacer. The base plate in the photo is for illustration purposes only. The 1" thick, billet aluminum, 4 hole spacer has a 7 degree taper through the stepped holes; it is for a 2.125" butterfly. The open spacer is also 1" thick, billet aluminum, with a 7 degree taper through the stepped hole.
Here is a view to highlight the taper.
Here is a detail of a typical smooth wall.
Please allow 1-3 weeks delivery depending on inventory