G'day Brian,

They're Old Man Emu Nitros from ARB. The Part# for rears are 2 x 179 and 2 x 180.
I've got the 178 s on the front. Not standard for 2.5" lift of the F-Trucks due to mine having the Dual Tower brackets. That tends to shorten the mounting distance between the top and bottom mounting points.

They seem to do the job and I've been over some bloody rough country with them and loaded towing 3.5T.

Cheers,
Reg