So I went to a mechanic after having my car sitting garaged for five years and he said it needs a new radiator and that a OEM one would cost at least 400 or more. He also said he can get one for like 280 but it isnt very good quality. So i went on gmpartsdirect.com and looked up the radiator for my year 2005, h2 sut lux. GMPartsDirect.com - Find a Item its less than 200 bucks... is that the OeM? or is gmpartsdirect tryn to confuse me? He suggested i get the oem for anything i can..

so far what it looks like is that I need oem radiator, air shock bags, left driver side mirror/glass I dont know how to find the oem part numbers so any help would be great. Also if those are the correct parts, what is the shipping cost for those items usually?

 

There are a number of online GM parts sites.
GMpartsdirect, GMpartshouse, GMpartsonline, etc.
Most of them are either dealers or someone connected to GM that have setup an online business.
They are OEM parts.
Check out the parts that you are looking for on a few of them to compare pricing including shipping costs.
Some of them are notorious for selling the part at a lower price but charging outrageous prices for shipping.
I have found that in general GMpartshouse.com has the best prices when you consider shipping included.

Also look on Rockauto.com. You can get OEM parts from them at a great price. It's where I start ALL of my parts searches.
AC Delco radiator for your H2 is less than $165 and I'll bet shipping is much less than GMpartsdirect.