That is really odd - My studs protrude right to the end of the spacer nuts....
The Pictures doesn't look good - I know its probably not as bad as it looks as the nut is tapered so more thread than you realise in contact, but that would worry me...
I could half understand front and rear studs being differend due to different brake setup, but would think Mr Toyota would spec the length of the stud protruding from the wheel mating surface to be the same all round to ensure the range of toyota wheels fit safely. This does baffle me!
Dave