Carb Spacer 4150, Professional 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 1.688" 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.

And here is a close up of the stepped wall.

This spacer is also available as a one piece unit for the same price.

Here is a top view.

Here is a bottom view.

Here is a bottom view detail.

Please allow 1-3 weeks delivery depending on inventory