The search function; a novel idea. Maybe these Sellers should realise that a single post with multiple items is not thwarted by the search function. If a Seller posts a, for instance, dome light in a multiple item post, the search function will find it.
Savvy Buyers can post in the parts wanted section.
I had hoped one, or more, of the "professional" Sellers might have replied to this topic, but, maybe, they don't use the General forum.