what do i need to make these work?
 

I have a 92 lebaron convertible with 15 inch rims and hubcaps. I am going up to a 15 inch 93 Sundance wheel(gold,30 slot). I'm sure the pattern is the same. Will i need longer studs to use these?I know I'll need longer lugs. Also, what is the size on the center cap and does anyone have these or know of a good source? i tHINK they are 1.85.Can I just use the caps with the five clips or do they need to have a really snug fit?Thanks for any answers!