[Rad7661]

Ok I thought it was original due to the clean professional appearance yet I found the item in question and appreciate the previous owner for this mod. I wish the distributor sold the insert separately because it also fits the TM curtain tracks. Anyway they are window framing strips by frost king and can be found at pretty much any hardware or home improvement store. Makes for a very clean installation. Thank you all for helping me try to figure this out. I love this forum so many tips and tricks and helpful people.