Bought an exhaust system for my daughters car from Car parts Northampton and was advised that studs on catalytic converter were basic everyday size and thread but that company didn't supply them with part, however on receipt I found out that this was wrong and that the thread size was very rare, after chasing all over the area to Screwfix, motor factors etc with no luck I found myself at Anglia fasteners in Bedford, extremely helpful staff hunted down the nuts and washers needed for this job and the price 78p. Very helpful and knowledgeable staff and will use them again.