If they are like the old Enticers I had (shock on the ski) spray penetrating oil on the bolts, remove the bolts, replace the shock. Mine came off easy. The shocks I replaced the OEM with were hydraulic and were not pressurized. If the nuts are rusted on, you may have to cut off the nut and use new hardware.
2007 RMK 700, 2008 RMK 600, 1995 AC Prowler 2-up, 1980? AC Cheetah