Replacement crossfader for Prime 4?

Hi there, I am looking for a crossfader that has a bit more resistance, ie. alot stiffer, similar to the channel faders. Is the flex crossfader compatible with Prime 4 and if not, any other suggestions as to what else may also be compatible?

I think the Mini Innofader Plus fits, but that has no tension adjust (to my knowledge).

Cannot confirm if the Flexfader fits (cable and mounting holes).