Posted for "Marc Wiese" <cardmarc@midsouth.rr.com>:
Yes, it looks like it is the same but I haven't measured the openings.
I'm just too lazy to go out and look at my 13Brews and the 20B (packed
up ready for my house move).  BTW, the pump housing on the 13Brew is
quite a bit "lower" than the 13Bs before 1993, and should be easier to
modify for lower profile. Is that the thought you other 93+ engine users
have mulled on?

I could send a picture of the 93+ pump housings if you would like to see
them. They 'might' fit pre 93 engines-I can't verify that, I rebuilt and
sold my 1991 engines.

  Marc Wiese