Thought may be of interest? Put this in after a few weeks of gathering all the pieces.
Dirty Harry back box speaker panel swapped with Virtua Pin back box speaker panel, Pinball Pro 5.25" speakers.
So both speakers are equal size with equal sized openings.
New BB spkr panel has 5.25" equal sized holes for both speakers.
5.25" WPC Pinball Pro Speaker kit, includes cabinet subwoofer with cross over (Yellow? Black +. Black -.).
2 5.25" bb spkrs.
Back Box mounted balance knob for bb/cabinet spkrs includes wiring to bb spkrs.
On Dirty Harry always has a Credit Dot for Time and Date not set. Pinball Life NVRAM from Lock When Lit.
For pictures posted in "The Dirty Harry Club" page 17,post# 837.