Those are Project Nissan tension rods. Seems like they just renamed them. The company is in my area, and I know the owner. There's a company called TopSpeed in the area also and basically those rods are from TopSpeed and made in Taiwan, IIRC. I know a guy who's been ruuning them forever without any problem on his 240, but also I've seen one side snapped on a guy's z32. He said he hit something and it snapped. Finish is not that good, so green paint will peel out badly though. Courtesy Nissan carries Project Nissan(Secchi) tension rods and RUCAs, and they said overall reviews are not that bad.