Tilt tube play

[1 Tuff 69]

Guys I have 1/8 to 3/16 " play in the tilt tube and wanted to try to tighten it up a bit on my 280, does anyone know what size socket that is for the 2 nuts ? its about 36 mm or 1 5/16 " 12 point I think but I came back twice already with the wrong one. thanks !

Mike