98 f-150 wheels HELP!!!!!

I found these wheels i like for my truck they are 20's and i was wondering what offset would i need to run cause my truck is bagged all the way around and i'm runnin the stock spairs and there 14mm offset and these 20's are +9mm offset and i was wondering if those 20's would fit or i need to find something with a diff offset cause i have no clue what kind of offset i need to run to clear the bedsides and fender.

ANY HELP WOULD BE GREAT!!!!