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It's actually 35mm and they do make them but they arn't easy to find. My son had to buy a full set of combination wrenches at Harbor Freight. to get one
Yup, 1 3/8" (which is 34.92mm). A very short socket would work. I bought a 1 1/4" wrench and carefully ground it to 1 3/8". Not an optimal approach but it worked fine.
when metric wrenches are close to sae they are hard to find. didnt want to buy a whole set to use 1 wrench. northern tool had the 1 3/8 wrench for 12$ good fit and lots of leverage to work in a tight area