I wanted a D tuner for my SP1 four string and Dingwall tech support said it would involve a lot of machining to get it to work. There’s very little surface around the E string tuner. Bummer, but makes sense.
Possibly this? I think I got mine included from bass direct. The one I have is the same AB Nate has.
(Clover tuner)
Very strange from tech support unless the imports have a different tuner configuration?
I can’t speak for bass but I know you have to be careful buying them for guitar but the post depth sometimes won’t have enough clearance to get a string thru without some mods.