I bought the Microcat EPC (electronic part catalog), which is what the dealer parts guys use, AFAIK. For the casual shopper, it's an absolutely miserable program... the user interface and navigation is just terrible compared to EPC's from other marques. (I'm used to Mercedes EPC, which is complex but very logical.) But, after spending ten times longer than it should take, I could eventually locate the part numbers I needed in Microcat for miscellaneous odds & ends of replacement parts.
The Microcat is likely to be more complete and accurate than the online dealer website listings:
https://www.ebay.com/sch/i.html?&_nkw=rover+microcat
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