After browsing GoJeeps site I notice he got an adjustable Panhard from Whiteline. I gave them a call and got some details and ended up ordering one from Repco fpr $255 (less than Whiteline but I think they forgot the GST).
Anyway, I'm very happy at that price. Also pleased to see they have adjusted the angle slightly at the chassis end to reduce the strain placed on the tie rod end with a lifted Jeep.
Here's a pic next to a stock one. If you're interested checkout Gojeeps site for part numbers.
Cheers
Steve