Okay, thanks for the info.
As for question #2, I took the term PCD from the 5Zigen website on the rim section. The 5 part is the number of lugs in the wheel, the 100 I believe has something to do with how widely spaced the lugs are? For instance, there is this table for a specific rim:
SPORTS ENGINE LF5000
Code:
16x6.5
+38 +48 4-100
+48 5-100
+38 +48 +53 5-114.3
I know it's a 5 lug but is it the 100 or the 114.3? Perhaps tirerack.com has some info?