Wheel spacers

I have a 2016 850 XMR and looking to put either 1.5" or 2" wheel spacers on. I contacted my deal and he stated that the hubs were 4/137 but I have tried 2 different sets and both barely fit the hub and stock wheels wouldn’t fit at all. Are these new bikes set up for 4/137 or 4/136? Thanks in advance.:th_smiliepullhair::th_smiliepullhair: