I'm impressed with Rutger's "creation", well done, my welding skills are not that good.
The Hazet tools are available on Amazon DE at approx. $50- each. The 4550-1 is slightly longer (120mm) than the 4550 (115mm), both fit the fuel injector line = 17mm nuts. I have both tools. I also have the Hazet 4550-2 which fits the fuel injectors = 19mm.
Best,
Mike