Nelly:
Sorry about your experience. If it is any consolation, I bought some cheep ones on ebay, they looked good, and I kept them on for a number of months, but I just did not feel comfortable with them so I too them off. The look alot like yours but with FZ6 stenciled on them. I also had a problem with torqueing them, it felt mushy so I stopped cause I thought I was going to strip something.
Anyway, when I took them off, the right side bolt was starting to corrode due to trapped water when it rained, so I was glad I took it off.
I'm looking for a quality set this time, and I've seen some with an O-ring on the bolt, I assume to keep the rain water from rusting the treads. Though next time I will use some anti-cease lube to prevent corrosion.
Good luck in finding a good replacement, I will be looking for member suggestions also.