86 B2000 timing belt size?

I'm trying to purchase a timing belt kit online, and it lists two different sizes for the timing belt. 19mm and 22mm. Is there any way to know which is the appropriate size without taking anything apart?

Thanks in advance

Hell - you can readily remove the top timing belt cover and measure yours. Just a few screws (I think four), use a 10mm socket.

that one bolt looks a little tricky to get to, but i'll give it a try.

i was just curious if there was a simpler way to find out.
thanks

no, but you'll also want to check if the teeth on the belt are squared off or rounded...kept chewing up timing belts until I eventually found out I was getting the wrong belt.