Yes it does seem the dimensions were similar but they found ways to make it lighter. The first one is one big hunk of steel! The last one would also be what came with super record. Does anyone have an other variations? Post them up! Interestingly, I needed the one on the far right years ago to have my headset 100% correct on my 1971 restoration. It ended up with the far left style. That bike has been in storage for a few years but when I get it out the correct race will go on!