Hi Klaus, I think I will go with your solution as this is by far the cheapest. Actually I was in contact with the original company, but they will need to fabricate both the locking and the wing type stud. The costs for four studs would be ten times of the costs you had with your ten studs at your dutch supplier.
I am currently sourcing all the parts needed, but unfortunately I just have two of the parts where the pin goes into and which are seemingly bolted to the lid and bonnet shown on your pictures (below). I cannot find a source for them. Can someone help with this question? Are these part of the original configuration?
Regards