It's a timing check tool , it doesn't have any association with the vanos. I don't understand the vanos clearance sentence? TIS does not mention vanos clearance. Could you explain? The check tool just has a little more leeway and not as rigid as the timing tool. Just allows for the tolerance of .5mm ( or whatever it is) lift of the timing tool on the head. The s54 timing tool has a stepped base while the s50 has a flat base like your pic. Maybe they both work equally but different part numbers and different applications to two different engines. Interested in this vanos clearance. Can you explain that a little more?