86160-0W380 & 86160-0W390- right and left side assy - is this the tweeter? yes
86160-0W400 and 86160-0W410 - right and left side round speakers on door
86160-0W421 - right and left side bottom door speakers
There are 3 speakers in each door. Ebay has all of them for sale. Hope this helps. Search Lexus SC430 door speakers and a diagram should come up.