You will get away easy with a final et of 23 on a 7j rim if you run something like a 175-185 tyre. I would go for 20mm.I may be wrong but those adapters look like they fit 5x100 to 5x114.3 hub. you need the other way round!
I also think those adaptors are the wrong way round, you need 5x100 to 5x114
WHY?Always a bad idea!
There are hundreds of wheels that fit 5x100 out there and I'm sure most if not all BBS wheels come in that fitment!I mean I run 15mm spacers but I wouldnt run on adapters! No way!