Check my thread hardegger, as I have used similar to lenso bsx (BBS replicas) however I used a wheel called FYK which are available in 9j et10 which fill the rear arch pretty satisfactory without spacers.
I just bought the Lenso BSX in 7x15 et (offset)20. My plan is to use 195/50-15 tires at front and rear.
What dimension of spacers would you recommend me?
I guess at the front axle there's no need for them, rear axle 25mm each side?
Your going to need some big spacers, particularly at the rear due to your choice of wheel
I'm on 15x9 et10 rear and 15x8 et10 front and the rear is still 20 mm short of the arch.
I would say your going to need 50mm at the rear and 25mm at the front
Was told it was not possible to make adapters on phone to reputable firm using cad had to go from 100x4 PCD to 108x5 all three quotes from USA said don't use Chinese (who wanted to use steal) Us use billeted aluminium went with the one who asked for most measurement, very happy except for import tax, also have 50mm spacers on rear.