I am using 15" 6.5J +45. You need a set of 7J +35 for the front wheel in order to clear the spoon caliper.
Unfortunately Rays is no longer manufacture 15".
16" 7J +42 or TE37 15" 7J +35 are the only option you can go if you want to use spoon caliper without spacer.
PS: I would recommend to...