sorry tyre help

im putting a set of 15in wheels on my panel van . the wheels are 15 by 5/2in and a et of 14 . what size tyres do i need to put on also need room to move when i get it lowered please any help would be great cause i hope to get back on the road after some work
thanks

 

195/70/15 is very close to stock size over all

 

Was lookin at gettin the sidewall à little lower if this is possible

 

do you like driving slowly using even more fuel that a standard bay ?

 

Its à bay So slowly is the way i drive and the fuel just got to pay i uses to drive a 2.5 BMW So use to the fuel prices i was thinkin 195_65_15 will i be fine with that