Here's a Triumph OEM Accessory 2 into 1 high slip on exhaust made by Vance & Hines. According to Triumph sites will fit the 2017-2020 Street Scrambler but I would assume it fits newer too.

This exhaust is great looking, sounds cool and reduces weight. Really sets your Street Scrambler apart from the crowd. No instructions but installation should be pretty straight forward. Includes mounting bracket and only one rubber mount, I read in a forum you use your stock parts for installation. Also includes the 2 graphite gaskets on the front side. So be wary you may or may not need some parts for assembly and you may possibly need fabrication and mechanical skills to install. I've also read it's good to buy a different side cover, maybe one from a street Twin. I've never installed an exhaust like this so will be up to you.

Very nice used condition, no dents or dings, no scrapes, no real damage but has a few marks and light scratches from normal use, installation and removal. See pics. If I had a brand new Street Scrambler I would not hesitate to install this exhaust, looks very nice.

Triumph part number A9700673 retails for around $920 and I assume, like most other Triumph accessories, may be difficult to find.

Buyer pays 48 state shipping of $40, happy to sell internationally  only via ebay global shipping program, thanks!!