On regular forks I just use the normal gaiters, I usually get something from a dirt bike, cut them down and secure them with Jubilee clips
On upside down forks I use Kriega's fork gaiters, very similar to flower_king001's gaiters, I don't know if these are easy to get in the US or not
https://kriega.com/works/fork-seal-coversflower_king's suggestion looks good too for conventional forks
I have Ohlin's on the Ducati and they are notorious for bursting seals, I had to replace them on mine after 4 years and very little miles, since fitting the Kreiga gaiters no problems
John