Spindle accessory mounting plate

Is anyone producing a steel mounting plate that can be attached on the side of the HDM’s spindle mount? I’m looking to mount accessories like a dial test indicator or mister (both utilize a magnetic base), and that seems like the best solution.

I picked up a chunk of this

at HD, cut piece off, drilled and counter sunk a couple of holes to match those in the HDM spindle mount. Works fine, lasts a long time.