Most parts houses that primarly use computers also have books. There is tons of turn over in FLAPS counter personnel and sometimes no one in the store knows how to use the books, so there's no way for them to learn. They all have books behind the counter, whether they know it or not. So, when you know more than the counter guy/gal, why not take the time to calmly teach them how to find the part? That way the next guy will know.
It's easy. say to them: "do you have a X book" (seal, bearing, brake parts, etc..) Then open the book- Tell them that all these books list the stuff by application AND spec, and usually have pictures too. Then go to the application section, find the type you need and then look for the dimension. Get the part number and then have them pull it for you.
As someone else mentioned, they will usually also let you behind the counter to go through the stock. That is how I've found radiator hoses, bolts and other items that are difficult to find by application when you are building a rod.
