Hmm...interesting.
The
Sway-A-Way website shows some Nissan t-bars at 27.5 mm diameter but shows the Xterra t-bars at 26 mm.
Xterraparts.com says their t-bars are 27.48mm
The 27.48mm being so close to 27.5mm makes me wonder if there's been a mix-up somewhere.
It's all a bit curious....