One of us is misreading it. The title of the thread is "Shield grip extension"... He wants one for the Shield that is "LIKE" one for the pistols you quoted. He wants the flat kind, not the kind that bend forward, like most Pearce. However, he confuses things when he says, "I saw that" referring to a guy who made a shield extension, but then says, "I don't necessarily like the "pinkie" extension, I like extension like the Shields have .. more of a "square" whole extension."
So he's either looking for a Shield pinky extension (I am). The 9c and 40c have that nice angled but flat extension.
OR
He's looking for a grip sleeve to use with bigger mags in the compact guns.