Just plug in your year, model, engine size, and use the pull-down pick list. I found (3) harnesses listed across the country; one said M/T so probably wouldn't work. Or maybe you can splice in the wiring that's different on the automatic. The other 2 listings don't say manual or auto, but you can contact them to see if they have what you need.
Also check the usual selling sites for parts and parts rigs; Facebook Marketplace, Craigslist, Offerup, etc.
You can check the Pick-n-Pull database for new entries, they're getting in more rigs every day, so if you can't dig one up elsewhere, maybe something will show up on their site: