They have a ribbed rubber flange that measures about 1-5/8" across the opening

vintage look

these extensions create a bold

They also come with a set of adapters so you can run these on 1-1/2" or 1-5/8" exhaust pipes

Harley-Davidson Twin Cam A Motor Engine Stand Subcategory_Motorcycle Mirrors They have a ribbed rubberWorking on a Twin Cam motor when it's out of the frame requires a solid, stable base. This heavy duty engine stand from Lowbrow Customs is specifically designed to safely cradle your rubber mounted Twin Cam "A" engine, giving you the confidence to tackle any job. Secure & Stable Work Platform: The heavy gauge steel construction provides a perfect cradle for your engine, built to stand up to serious use and abuse while you work. Designed for Twin Cam