Where does a tire seat on OEM rim

Can someone describe where the actual bead is on a 17' OEM aluminum rim.
The new rims I just picked up has old rubber residue all along the lip and I am not sure if this will interfere with the seal.


backround of my situation as described in a previous thread:
Just had my tires replaced on my 03 Explorer and the next day air had leaked out of all the tires. The dealer attempted to fix it with bead sealer however that also did not work. My solution was to pick up some used OEM rims on craigslist.

 

[jrford]

one or two shops i have been to have a special machine that cleans up old alum rims. They set the rim on it, it rotates and grinds/sands the beads.

But i don't think all have them, i got stupid stares at one store when i asked if they could do it, . . .'we use a wire wheel'. Another option i heard about is to have the rim re-finished, no idea on cost.