Well......I've got to come back on this.....I've searched and searched, on-line and at professional suppliers (who sell quantities) and it appears that there are NO carriage bolts under M5.
For those interested: In Europe, we use the metric system for indicating bolt and screw sizes. M5 simply means 5 millimeter, or 0,05 meter.
Simple and clear. However, the M5 carriage bolts sold here are simply too big, and I can't anywhere find M4 carriage bolts....it's nuts ! (yeah nice word-joke there

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So, if a good sole on the other side of the Atlantic would throw the parts listed above in a (thick) envelope for a couple of bucks I'd REALLY appreceate it.
I don't know who of you have to specialy order these or if anyone of you has these laying around. I don't know if places like Home Depot sell these f.i. So please let me know here how much trouble it would be for you.
Oh, and that nut, you can through in one or two extra, also in size #8 and #6, I want some of these around for the future

Thanks !!!