Hi William, I think you actually have a couple of options here.
EGW makes this mount, if you have the Walther slide -- https://www.egwguns.com/vortex-viper-venom-colt-1911-22-rail-gun-walther-slide-22-sight-mount-fits-burris-fastfire-and-docter
And MSP has this model -- https://www.mountsplus.com/1911-red-dot-mounts.html