Too many more pressing things to do and I am not known for my accuracy only my bodging abilityget some sheet metal, a drill, hacksaw, files and make them yourself
Its just to guide it accurately in to position when clamped it will have nuts to do the proper workCheap, fast, good.
Please pick two of the three and you will receive better answers.
I could manage one of the three, good, but at £60 each plus postage and three weeks' delivery, that will not meet your requirements.
3mm thick plate is not going to take an M8 thread very well. It is not even three full threads.