1978 vw bus wheel size ,offset and clearance. Can anyone give them to me and......

i am planning to get some new rims for my vw bus with 185R14 tires and 5 lugs(original wheels). i want to know the measurements for the wheels,the offset and the nut space for it. i really don't know how or what are they. I want to add some 14" or 15" mag wheels,maybe EMPI or FUCH style . Can anyone give me this information . Another question,where i can get disk brakes for the rear and front or at least the front ones but updated to better braking power.Lowering the front to ,so any help will be appreciatred;danny