The one that I bought for my Warco VMC mill in 2015 certainly was. It wasn’t a straight bolt-on accessory, but wasn’t difficult to fit as I recall. Fiddly, yes, getting the shimming of the bevel gears right but that’s all. Easy job done in a couple of hours. (He says, from a hazy memory of ten years ago!)
Don’t Warco have the answer? I’ve always found them to be helpful when questioned.
John