I'll read the Pryor article, in more detail, but from your gloss and from a quick scan, I still don't see where Pryor and Sellars are even supposed to disagree. I think, without being totally sure, that Sellars would answer the title question of Pryor's article with an emphatic 'yes!'. Experience of a red car justifies belief that the car is red. While experience of a red car also presupposes a battery of other concepts (including epistemic concepts), these concepts are not related to the knowledge of the redness of the car as premises to a conclusion.

Here's a quote from EPM p148, which illustrates that the above is Sellars' view (italics mine). Note that in the following, Sellars is sketching the view he wants to attack:

One of the forms taken by the Myth of the Given is the idea that there is, indeed must be, a structure of particular matter of fact such that (a) each fact can not only be noninferentially known to be the case, but presupposes no other knowledge either of particular matter of fact, or of general truths; and (b) such that the noninferential knowledge of facts belonging to this structure constitutes the ultimate court of appeals for all factual claims -- particular and general -- about the world. It is important to note that I characterized the knowledge of fact belonging to this stratum as not only noninferential, but as presupposing no knowledge of other matter of fact, whether particular or general. It might be thought that this is a redundancy, that knowledge (not belief or conviction, but knowledge) which logically presupposes knowledge of other facts must be inferential. This, however, as I hope to show, is itself an episode in the Myth.

So Sellars wants to argue that empiricism has no foundation because experience (as an epistemic success term) is not possible without knowledge of a bunch of other facts. But it does not follow from this that a) Sellars thinks knowledge derived from experience is inferential, or b) Sellars thinks non-inferential knowledge as such is a problem.

But that said, I haven't read enough of Pryor's paper(s) to understand his critiques. I'll take a look.