Which dustcap

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I'm looking for right-side dustcaps for some Ultegra rear hubs -- both
"8-speed" and "9-speed" hubs.

Loose Screws sells some

http://www.loosescrews.com/index.cgi?c=Hub&sc=Dust%20Caps&id=265636020573

but I can't tell which are the right ones. My hubs have soft seals on
the cone so it looks like MP-20.3 is correct, but maybe the MP-DS9
will work on the 8-speed Ultegra?

JT