Correct bolt size Matco

[TJay 1041]

Just got my 3 leaf tail spring and was wondering when using the Dual fork matco tailwheel is there a correct bolt size for that, It looks like the Matco has a 5/15 hole in it and one spring has a 3/8 hole in it and another spring has a 1/2 hole in it, Im guessing the 1/2 inch hole is for movement. I found a drawing that looked like it uses a An-7 bolt at the rear,

[C5Engineer 1170]

I'd shoot an email or call Matco. They are really good about getting right back to you.