Bonnet Rubbers 65822-01M00 You need 2
Boot Rubbers 01658-01351(9109+) or 01658-01811(8908-9108) You need 2, they're not a set either.
Cooler piping rubbers 08911-1082G, doesn't tell me how many you need, count them I guess?
Hope this helps.
Hubs mate, won't affect width. have a full set of 5 stud hubs if you're interested? You will need to either upgrade the brakes or get some blank NA rotors to have drilled to 5 stud as well as doing the hubs though.
18x10 is extremely silly to say. an 18x10+45 will sit well inside the guard whereas an 18x10 +15 will poke quite a bit even with some lowering. DO your homework instead of asking silly questions like Will an 18x10 fit or will it be too big.
You could always buy them through Amayama instead of the stealership.
http://www.amayama.com/search/?q=54055-15U00
At the most you're talking $16 each.