if they came off a classic they must be the correct PCD. Do you know what year classic
I expect they will clear the four-pots looking at the spoke design
it's not just the offset that will effect it but the thickness/depth of the spokes.
ET51 should be fine, mine are ET51
the only comment would be that the 40 section is too tall, you need 35's on 18's When your speedo reads 60mph you will actually be doing 62.5mph
with 35's When your speedo reads 60mph you will actually be doing 60.2mph
there may also be arch clearanceissues on the 40's
http://www.kouki.co.uk/utilities/visual ... calculator
I have a nice new set of Falken 225/35x18 in the shed