Same thing happened to my Tiger about ten years ago after an annual, except the gas cap and receiver twisted off. Ended up ordering two new fuel receivers from FletchAir, fuel cap gaskets, and appropriate bonding material again from FletchAir. FletchAir also emailed the appropriate procedures for the task. When removing the old bonding material use plastic scraper only and scrap away from the fuel opening. Clean the tank fuel opening and fuel receiver with fuel cap on, then bond per procedure.
This legally is a job for an A&P, mechanic with airframe certificate, or CRS repairman.