I got the 300M T-bars from SLR, 27.5 mm, and they ride pretty nice and never broke.
I did spin a t-bar anchor once though, and I think its a weak point on the X...I think raiding local junkyards for spare X t-bar anchors so you have some on hand is a good idea.

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- TJ
2001 Xterra '03 VG33, SE 5 spd, 305/70/16's, Revolvers, UBSkidderz, Doubled AAL's, 3"SL/2"BL, winch/bumpers, skids, sliders, OBA, Snorkel, pine stripes....
Friends don't let friends drive stock.
http://www.gifsoup.com/view/501230/tj-tackling-crawlers-ridge-o.gif