Correct on the MGB bonnet catches - I just replaced one after evidently overdoing the 'slam', but adjusting both catches in sync with the tension needed on the hood is a tricky process at best.......and yes, reading of the demise of the plastic lever makes me think I could be revisiting this all again soon, so an 'upgrade' would be most welcome.
"Si fractum non sit, noli id reficere" - but not in this case