I was just curious. I believe the numbr on them is something like 4230. I know they look like something you'd find on the back of a much heavier truck, not a lightweight W100. Five thick leaves, standing on the bumper didn't flex them a bit and when I pulled the engine-tranny-transfer case, they didn't seem to give much with the weight removed. My boy drove the truck home and he said it rode like a log wagon, a regular teeth chatterer. I disassembled them, kept the top leaf with the eyes and replaced the others with thinner, softer leaves from the back of a LeBaron. I'm hoping to get a little more sag to them when I replace the engine and hopefully a softer ride.