There was a parts lists for most models. PUB1056M is one Doug has mentioned in the past. Otherwise the mini kingdom parts book is a good reference, along with John Sneddon’s book
viewtopic.php?p=775501#p775501winabbey wrote:
The Parts Catalogue specifically for the MK II series, including the S is PUB1056M. It's a bound publication, not loose leaf, and has a red/purple material binding. Like almost all BMC/Leyland parts books it's full of errors and omissions. For example, the alternator is not included, only the generator. With the Mini K specific catalogue mentioned above you end up with most of the right part numbers.