Griff 500 rear wheels wanted

[simpo one]

A friend of mine writes: 'I bought some front 500 7 spoke wheels at Duxford looking for a pair of
rears now for track days etc - do you know of any. The factory expects to have some in April (batch coming from the makers) but they will be loadsa
money I'm sure...?'

Does anyone know of a pair? Thanks.