Tiguan wheels are 5x112 so won’t fit a Transporter, which is 5x120.
The Transporter centre-bore is 65.1 mm - bigger than the Tiguan.
Make sure whichever wheels you find are load-rated to match your axle weights
(ie: T28 has an axle load of 1600kg, so the wheel has to be rated to carry 800kg or more.
If you can’t confirm the wheel load-rating - and tyre rating for that matter - then you’re chancing with prosecution and insurance validation.
Oh and welcome to the forum.