The problem with Rockauto is they will try to screw you over if the wrong part number is listed. They did me a few years ago and I've never ordered from them again, and never have, even if I have to pay more (had to go to the Wisconsin BBB to get my money back, and that was only after getting insulting letters from the owners).
They are a couple of dollars cheaper, but by time you add shipping, they cost more. If they are a lot cheaper I just tell Advance or O'Reilly and they price match, plus give free shipping.
You don't normally think of Amazon for O2 sensors, but I got my last ones there and had no issues at all and others have as well where I've posted the link, and been happy.
Yes, you can get "universal" O2's for a bit less that you have to splice the connector on to, but I've read very mixed results with them. For me it's worth the extra $15 for no hassle and no worries about them working.
Four wheel drive allows you to get stuck
in places even more inaccessible.
62 88 Regular
67 109 6cyl NADA x2
74 Lightweight - The Antichrist
95 DI 5-speed
95 D90 5-speed
97 D1 Automatic