I wouldn't twist on them. Is your SB a rear kitchen? If so, it might have two gray tanks , one fore and one aft of the axles. Is it enclosed underneath? My 98 30 CKFS was enclosed but I think the handles were still visible, outside, but the valves were in the insulated area. My 2000 24 CKFS wasnt enclosed and the valves were exposed and visible. My 2008 30 RKFS LTD is enclosed and all the water works and drain handles are in their own compartment. It's a rear kitchen with two gray tanks and valves. So, you can't find the other two handles? Maybe stop at a dealers shop for help. Craig
