Linkage Drawbar

[Old Hywel]

While digging in the darkest depths of the shed I’ve come across two linkage drawbars. I think I know which is which, but would like confirmation.
One is a 9 hole, the other 11. Category one.

[Hair Bear]

The easy way to check...

Place a pin in the middle hole
Count the number of holes to the left; X
Count the number of holes to the right; Y
Factor in the number of holes occupied by a pin; Z
(X+Y)+Z= which one is which.