buying used

I have a 98 gsx looking for the rear bumper trim it is (rear bumper trim (indigo) 291000866) can’t find wondering in someone has one laying around that’s just a part ski they would be willing to sell me one off of here’s ski for reference it is the blue one on the left

How do you logistically work out buying a boat from a private seller and getting it checked out? Do I offer to pay for part of it and take the boat, but not the title? Or do I ask the owner to hold a check? The local seadoo dealers all say that an inspection can take up to a week. How do I ask a...