The hole for the screw holding the sensor was unthreaded. Both stems I ordered had to be threaded before I could attach the sensors. Luckily I had the right tap for the threads, but it wasn't until I almost hosed one of the screws that I realized the threads hadn't been tapped. I like this style compared to all rubber which tends to rot and chip with age. I'm not sure what "transparency" and "thickness" have to do with what, so I just matched "general".