The challenge then is the dozens of engine types, transmission types, axles, etc. and a ridiculous list of what is what.
Listings work best if the part is listed based on what it came from, IE if the 1FZ-FE came from an 80-series, and then allow the buyers to narrow down. MOST buyers will prefer to find a part that came from their same model, since it reduces the chance of mis-matches. The experienced shopper will already know to add other models into their search criteria.
Filters (right side, text link JUST above where the listings start and 1" below the Post Ad button) is a quick/easy way to filter the listing. OR, when you are in Engine and see a listing with the 60-series olive button, click that olive button and the listing filters to just Suspension AND 60-series.
On the overall/main listings page, the Section text can be clicked to link to that area, Ie: Interior...or the model number....or for sale.
Maps are always located at the very bottom of the list, and cover the items on that page....Ie: if you are in Suspension, narrowed to 80-series, then that map shows only those applicable ads, up to the 30 max per page. The maps simply get too crowded otherwise. You can fullscreen the maps, then zoom in to a region, then click on the marker and the ad summary will pop up.
For instance:
IH8MUD Classified Ads
forum.ih8mud.com
I clicked Classifieds, and came to the total listing...then clicked the first olive 80-series button I saw. Immediately filtered to only that model, full rigs to mudflaps. If you are shopping for model specific stuff, it's a super quick way to filter down to that days new listings.