Hi levinet and others here.
I came to your forum from a Google search on rego plates. I have just recently set up a small manufacturing business in Tasmania whose sole purpose is to make licence plate brackets to match specific vehicles. I market the brackets under the name "Lakin Custom Plate Brackets".
Generally we design brackets to fit with the manufacturer's mounting points, but I understand this may not be possible in your case. We also have a design-your-own service. You can download a form which explains what information you need to supply us, to have us manufacture a bracket that suits you perfectly.
We can offer special discounts for car club members too. If this interests you, or anyone in your club, you might like to check our web site - www.lakinplates.com - for more specific details, rather than have me bore you with too much information here.
I hope my blatent commercialism is not offensive to you. While I don't have any special interest in Skylines, I AM a car enthusiast - from WA originally :-) - and understand how enthusiasts like to get all the small details right.
Regards
Tassie - Philip