I couldn’t find an answer for this anywhere, but we’re clearly not the only people trying to replace the bottom hose between the Holden red engine and a land rover radiator. So…
My setup:
’73 Series III, originally 2.6 6cyl, now a Holden 173.
Water pump inlet: 38mm
Radiator bottom outlet: 34mm
Length: approx 40cm.
I’m ordering a Mackay 3538406F flexible universal hose, should fit just fine.

