I noticed while I was browsing OPG that their rocker panels come in the 2-door and 4-door variety. @ door is about $35 while 4 is about $90... On other sites they often only offer one kind of rocker panel, and for $90. Is that 2-door rocker panel what I need? Here are links to both...

http://www.opgi.com/virtual3fright.asp?catalog=CHEVELLE#anchorTop

Ok well,will have to clik the link, then go to...
Sheet metal, Misc. Parts
Steel Below Door Replacement Rocker Panels
And they are in the window that will pop up.

The pics on their web page for both parts are the same, as you will notice. Confusing for a guy like me who has never replaced rocker panels, let alone any body parts.

Also, has anyone that has bought these liked/disliked the quality of these parts?
Thanks a million guys!

if you look at it again, the price difference is because of the different years, the earlier ones are cheaper while the 70-72 are more expensive.
one thing i dont understand though is, 2 door rockers are shorter then 4 door and elky as well as wagons, so i dont know why they dont differentiate between them.

Ah yes, you are right good sir. Makes more sense now, except I don;t know why the earlier years' rockers are so much less. I saw some NOS rocker panels on ebay that I think I will have a go at. Thanks for the clarification. If not ebay, I will just make my own rocker panels. I don't need to be paying $200 for a few punds of sheet metal. Thanks!