Thanks guys, looks like 1" was the size for these. I was thinking 1" or maybe 1-1/4", been a long time since any of my originals were around. I looked at Mar-K bed assembly guide on line, and they are calling out 1-1/2", so I guess I'm not sure what to actually use. I would think 1-1/4" would work well, but the picture from Barnfinder49 shows they were 1". I will decide on something soon and get everything ordered.