Seat mounts and harness
I think you will find inspectors don't look that close. My dart has the seat mounted to the floorboards by four bolts going thru the sheetmetal and four inch diameter washers. Nothing from the seat back to the crossbar. Seatbelts to the stock mounts,crotch to another four inch washer and shoulders to the crossbar. Been like this for twentyfive+ years. If an inspector spots something not complying to the rules,they often tell you to change it before you come back and will let you run. Things like missing lugs,wire battery tie downs,leaks and no catch can will get you rejected. Remember,this is a business/job for them. They want spectators and love participants and want to keep their jobs.