I've been thinking for some time over this... I think the 'cone' head as in the shepperton gigs (Entwistle's Spyder) looks best on these basses.
But then again, you're talking about a 5er... so it would be a little wider I guess.
Maybe Elan style? and I like the headstock on the 'Alembird'
Sorry...not very helpfull, but It's a start
Cheers!
F.C.