by Warkton Tornado No.1 » Fri Jul 21, 2017 1:36 pm
They are interchangeable having the same fixing hole/plunger hole centre distance.
It's just that the correct 'type for type' looks better.
However, if 'gash' is your thing (not saying it is!) then 'swap away', as they say in the Fens....allegedly.
Seriously, the PHBH 'triangular' type might be the default choice (if only one type available) as it can be cut to look better if using on the VHBA/B/C