Trekwood - but be prepared for sticker shock for both the material and shipping!!
https://www.trekwood.com/
There are two sizes, 2-5/8" and 2". Measure the 'free' length. The free length, if 2" will measure 2-5/8" overall while the 2-5/8 will be about 3" overall. Both will work as I found after ordering the longer and installing it. You may also need the bulb seal as well and is a separate piece that snaps in a piece of molding and held in place with a screw in each end. It, too is kinda expensive.