2022 compass seat parts

I’m hoping someone can help me out. I have a 2022 compass. When I got back from my last fishing trip I discovered that the plastic piece that attaches the back of my seat the the bottom section was gone. The nut must have worked its self loose and it fell off . The bolt was still in the bed of my truck but the nut and the part that attaches the two pieces together was gone. I’ve tried looking online and have had no luck other than buying a whole new seat with is over $300 on eBay. Unfortunately my local hobie dealer closed up shop about 2 months ago. Any help would be appreciated.