Mine has the painted tube where the EX had the stainless and might be slightly different but mine measures 1-87/128" which is slightly larger then 1-5/8. So 1-3/4 is too large...and 2" is way too large. I would get something in a 1-1/2 size with a rubber I could..."adjust" to fit the tubing. Or get the 1-3/4 " knowing you will need to add shim.