I am looking to buy a set of these wheels with or with our tires in good shape. will need to know what they came off of so I can check the fit for me.
Just a suggestion, but your better served by asking the owner of the wheels being considerd to post the actual numbers that are either stamped or cast into the wheels. The numbers you need are width, diameter & offset, and if your putting them on your W124 you'll be looking for offset numbers between 30 & 45, (mostly) depending on the rim width and if they're are being mounted front or back. The numbers on the backs of the wheels should look like this 7.5J x 17H2 ET37 for a front wheel, or 8.5J x 17H2 ET30 for a rear wheel, (or 7.5's all the way around...) This is just an example of something that will fit, there are many other cominations that also work well. I have the Monoblock I, (5 spokes), on my CE in the sizes shown above.
Finding out what car they are on right now isn't perfect, as wheels get moved around so much current owners may have no idea what model benz they originally were purchased for.
Also there are a few types of AMG Mono Blocks, and not everyone uses the same name for all of them. So it's probably better to show a sample picture of the style your looking for, or alternately do a little homework and find out the actual name of the mono block type you want.
Here are some pictures of the more popular monoblocks with their common names, hopefully you will see the type your looking for here. There are other types not shown.