Dude, dealers are freakin rip offs. They're going to try to sell you crap you don't need. Also, they'll overcharge you up the arsehole on labor~! First thing, just because you have bad bushings, you don't have to replace the whole damn tension rod. It is an easy install that can be done by any novice mechanic with a set of wrenches, sockets, a floor jack, a vise, and jackstands.
Here's a complete pictoral taken from importnut.net (Al's a good guy):
http://importnut.net/240pics/bushings/page_01.htm
PDM-Racing carries Whiteline tension rod bushings for $45.00:
http://www.pdm-racing.com/prod....html
Courtseyparts.com/Courtsey Nissan of Texas carries Energy Suspension tension rod bushings for $36.95:
http://www.courtesyparts.com/M...7105G
$370, IMO, is such a damn waste of money to be spent on a new pair of OEM Nissan tension rods equipped with OEM bushings. I suppose an hour of labor is caculated in there already. But seriously, if you do-it-yourself, it'll take 1 to 2 hours. With $370, I would rather get a set of these:
http://srswap.com/shopexd.asp?id=429
I hope you make the right decision.