Abbey are very knowledgable and good guys, no doubt..........
Nobody has questioned your logic. However, the OP was advised to phone Abbey for some advice. In your own words Abbey are 'knowledgeable and good guys' and I am sure their business is profitable enough without having to stiff someone into buying a relatively cheap part. Furthermore, at no point did the OP indicate that he intended to buy from or Abbey or use them to fit the part.
What I basically trying to say is the advice offered by you, while prudent in most situations, holds no real............actually, why do I even bother? C0ck.