I got that same double springer fork with the disc brake mount except mine is the Sunlite brand , I'd part with it been sitting in corner of shop for a while, what is the dimension of head tube ? For I got a few suspension forks with disc brake tabs.
really need to know the headtube length, just don't want to sale you something that won't fit, I have some other suspension forks as well , I'll go over to the shop and take pics and measurements and post them for you