Ski-doo 2-up with linq large cargo box

I recently bought a 2017 ski-doo expedition 550F. This sled is going to be strictly for ice fishing and the plan is to acquire a linq large 24Gal (90L) cargo box on the back but also utilize a 2-up seat (preferably with a backrest). The 2-up seat that is currently on the sled seems to be a tad longer than some of the current 2-up seats like the linq 1+1 and would not accommodate for a large linq cargo box. From what I’ve seen on some of the new Aces, there’s still enough tunnel space to fit a large cargo box with a 2-up seat. Considering my expedition is virtually the same specs in length as the newer models I refuse to believe that there’s no possible way to make this work in some form or another whether it’s a one piece 2-up seat with backrest or different seat combined with a backrest separately. Being a Gen 4 sled, does anyone have experience fitting any of the current 2-up seats on any Gen 4 xp models or have fitted any 2-up seats with large linq boxes. The ski-doo website claims the linq 1+1 2-up isn’t compatible with my sled, but then again there’s accessories that do indeed fit despite these claims from ski-doo. I’ll attach a picture of my sled below. The cargo rack at the back will be coming off. I appreciate any help and advice