I might try these... But I hate most of them when the customers abusive driver blows them out a week later. And I set them to where they barely work unless you have a strong leg. Had one guy bring me a truck 3 times and swore the brake didn't work. I got in, fired it up and slipped it into gear several times with no problems. The driver got angry and said "no,no,no, that's not the problem". We had a bit of a language barrier here.
I finally said "Show me". We ended up going for a drive? Then he shows me he's trying to use the clutch brake to upshift. I called his boss and told him don't send that guy back to me.