Hexagon mono fork on Gilera Runner

Does anyone have any experience or know if the stem on hexagon mono fork fits to runner, or does it require any modifications?

Thanks!

 

I used a gts front fork on a NRG, just cut stem off and welded using a steel slug into nrg stem to length, I made a post years ago on this forum about making forks fit. used a nrg rear wheel on the front with a machined hub.