OP apparenty doesn't want to share a link. He posted this on another sub as well and still didn't include the brackets used. Another poster did something similar and said they used these.
The spiral wire ones are better if you have to have wire. I use the Nylon ones with the replaceable heads.
A lot of people have been using wire brushes for a long time. With the current quality of import brushes going down, I wouldn't chance it. All it takes is one bristle out of the hundreds on that brush to ruin your day.
This is the one I have. I've had it for a couple years and haven't had to change the brush head yet. https://smile.amazon.com/dp/B00IJ3C28I
Fits perfectly on the 590. Set your temp to 400F and churn out this deliciousness in 6 minutes.
Green Mountain Grills Wood-Fired Steel Pizza Oven Attachment Accessory for Daniel Boone/Jim Bowie Model Grills with Square Pizza Stone, Silver https://www.amazon.com/dp/B01MR2NFGT/ref=cm_sw_r_cp_api_glt_i_4MXBXG6Z8E6H4ZWDKHWY?_encoding=UTF8&psc=1
https://smile.amazon.com/gp/product/B08FM2231D/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
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86.5x 50.5 x49.5 with the extra width believe $35 should address it, and it's 600D material... wouldn't have thought this without you #kudos
I have the Camp Chef griddle instead of the smoke box but they are the same width. This fits perfect and is very high quality with a waterproof PVC backing. Classic Accessories Veranda's... https://www.amazon.com/dp/B08WQ1MG8D?ref=ppx_pop_mob_ap_share
I use these in my RT-700. Nearly a perfect fit, and a lot easier to deal with to me
Traeger BAC410 Pellet Grills Pro 34 Tray Liner-Quantity 5, Brown/A https://www.amazon.com/dp/B06XT4K4YM/ref=cm_sw_r_cp_api_glt_fabc_00F8NX54PG0NJJ744PSN?_encoding=UTF8&psc=1
I have two. I like them. After getting my grill I found these would have been a lot cheaper. I haven't used them though.
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https://www.amazon.com/FEBSNOW-BBQ-Grill-Mat-Reusable/dp/B0833S38ZC