Depends on offset and if it's lowered.
not lowered, just want to know what the widest wheels will fit on a bone standard mk3 caddy
It really depends on the offset of the wheels, if the offset is wrong then even narrow wheels could foul the suspension or poke too far.
17x8's using 215/40 tyres well thats what I had on my Mk3 Golf
MK3 caddy is based on MK5 golf so comparing it to a MK3 golf is pointless.