choosing replacement hammers

[Annie Grieshop]

When replacing hammers on various pianos, how do you decide which
brands/qualities/etc. to choose for any particular instrument?  Of course,
I'm assuming that an older console might not get the same quality
replacement hammers as a newer grand -- but maybe that's a
penny-wise/pound-foolish approach.

I'm faced with the possibility of several hammer replacement jobs in the
near future and, so, would appreciate any enlightenment now.  Thanks.

Annie Grieshop