I have two pullers; I just didn't find the right bolts the first time through trying them all. Now I feel stupid. I would say, looking at those bolts, that I bought them some previous time. They were a different length and had shorter threads. But I slept since then. Hundreds of times.
Always a GREAT idea when working around the shop or especially on vehicles, to get one of those cheap plastic nut and bolt size thingys (yup, all the techno lingo! ) I have one standard and one metric, and another for wheel lug nut spacing. Cost around a buck at a swap meet but would save having to ask like this.