1986 Winnebago Elandan -
p30 chassis common to many rv's of the day, pantogram wiper arms likely common too.
Original wipers no longer available, and I sure didn't want to see the cost of new pantograms with J-hook mounts.

hunted through auto parts stores, and lucked out finding Trico Exact-fit 20-1 (from Lordco) slip over the outside of the pantogram mount.
Threw away orginal mounting screw, replaced with a 3/4" 6-32 machine screw, washer and nylock nut - and after stripping out guts of Trico blade, the machine screw fits through the pivot hole. Easy peasey!

Thanks for posting your suggestion.

Possibly as an alternative, wiper blade refills are available. I drive a number of classics. I've wanted to keep the original arms and blades. I simply replace the degraded rubber with refills. An example is https://www.amazon.com/dp/B07M...t_b_fed_asin_title_2