Do Not, I repeat Do Not, use Dorman products whenever possible. On my 2005 Tahoe Z71, that I have gone thru and done extensive work on, there is not one Dorman part. I use Genuine GM or AC Delco whenever possible.
You want cheap, go ahead and buy Dorman. I will say I have used them for customer's vehicles for things like oil pan drain plugs and clips assortments and such.