I'm talking about the fuel filter on the engine (I always found the primary and secondary nomenclature confusing). The coarse pre-filter is not related to the engine model and can be anything, plus it's relatively easy to look up filters for it and they're quite cheap.
Yngmar; thanks, pretty obvious I suppose. In future, I'll refer to all filters as 'Pre-Filter', 'Engine Filter' and 'Oil Filter'. That should make it a bit more intuitive. I can't think of any others on the engine, apart from the air filter.
Nigel; I'll PM you in a month or so with a reminder.
Odysseus; Yes, that's how I found your original thread but having a specific page on the site will allow the spready to be administered in one place, perhaps with its own thread for update notifications(?).
In general, is there anyone who can't view an Excel Spreadsheet? If so, would a parallel PDF be acceptable? (not sure how that would cope with a separate tab for each engine type but that's for another day).