Both can use the standard OEM caps. The MDC stalk is made by Delphi (who also makes the OEM stalk), where the Area451 replaces the collar on the existing stalk. Either way, you're probably good.
One thing to note, at least one person (who I think had a 451?) found that over time the OEM cap can split with regular pressure/use. I think he wound up buying a set of aluminum caps from one of the vendors on here and found they worked as well. That may have been a special case, (poor OEM end cap, or unusually high usage) but it's good to know there are options either way.