We use Tranco Valve Guide reference numbers predominantly, which comprise the prefix G followed by a two, three, four or five digit number (which was later prefixed with 110-) and the suffix B for bronze guides. No interchange or search facility is provided for James reference numbers; though if you know the James reference of the Guide you require, please email and we will advise the corresponding Tranco number if available. We also list a limited range of later TRW (prefixed 81- e.g. 81-1757, 81-26106) and AE VAG 92000 and 96000 series numbers. These Guides feature the manufacturer prefixes TRW or AE, rather TR, than before the numerical reference. The majority of Guides are listed with key dimensional information - Fit Diameter, Bore Diameter and Overall Length, as well as Length to Flange where applicable.