Hello Safeone, found it yesterday and thought it might be of interest. I’m unsure on the WZ prefix as I can’t remember seeing any, but yes they used to get a similar rating from insurers IIRC, before everything changed when the euro gradings came in of course.
Weights were 2150 kg for the 5520 and 3030 kg for the 6428. Just realised what I’ve done as the weights are on there, I forgot to post the back cover with the dimensions. I’ll see what I can do.