Or Denver Fleet or Boulder Offroad, pretty much anyone who plays with Offroad vehicles and does at least moderate fabrication can handle that. I'm sure in Denver there are a million Jeep/Offroad modding places.
I had a Reunel on my last van and once called them to price swingarms, thinking I might have it done on a trip to Oregon sometime (I'm in Tennessee so shipping is out on something that big and heavy). They quoted me like $1k or something insane like that. Surely you can do better locally, especially since you have one already on one side for someone to copy.