Yep, screws not Dzus. Happily, another 5 minute job with the wife’s help reattaching the frame. While I was there I quick tap and die job on the screws and body mounts, so I can do this again in 10 years.
TS58370 is close to the “magic” 60k change point. After all this time I don’t know if there is a TS59999 car. I’m guessing there is a jump from the mid 59XXXs to the 60k cars.
Thanks all for the help!