Generac 2400 PSI - Pump Replacement

Hello All!
First time posting in this forum.
I have an old Generac 1456-0 powered by a Honda GX160 which runs well.
Want to fix a water leak between pump and spacer plate but there are few parts available.
The pump attaches with 6-bolts to the crankcase (see photos) but most replacement pumps attach with 4-bolts.
Can anyone recommend a suitable replacement pump with 6-bolt attachment?
Many Thanks,
Mr. T.