UCA Bolt Size Confusion

[mscot]

Quick question about the UCA Bolt size. I've see conflicting information.
Some posts have said it's a 19mm on both sides and another said it's 19mm on one side and 22mm on the other.
Can someone clarify this for me? I just bought a new wrench set but it doesn't have 22mm wrenches.

Thanks

Edit: Most instructions I see say it's 19mm so perhaps I just came across a post with a mistake about 22mm. :shrug:

 

[nb rob]

19mm both ends.

I bought 2 extra long ratcheting wrenches so I can loosen them up without having to remove the small brackets that get in the way of sockets. They work like a charm. zerks get a shot of grease much more often now that's its a quick operation to loosen the thru bolts