3/8" is the "standard size" pin. There are some "heavy duty" landing gear that use 7/16" and some of the older Stromberg/Carlson legs used 5/16".
The ones on my Cougar are 3/8" so yours should be the same ???? Even if they aren't, if the holes are a bit too small, an afternoon beer and a 3/8" drill bit would fix that problem in a hurry
I'd guess the ones you found will work, but realize that they only cost about $15 each, so depending on what's damaged and the price of what you found, you may have to decide if it's a good buy, an OK buy or ?????