</font><font color="blue" class="small">( Do you get all the lateral clearance you need or is there any problem with this? How much were they? )</font>
I can't remember the exact price, but they I think they were around six or seven bucks each, which is in line with the info you found at Constantine's. I thought they were kind of pricy at the time, but after having them and using them to move lots of stuff around, I'd gladly spend the money again.
As far as lateral clearance goes, that was one of the reasons I got them. I have a
BX23 with the 60" deck and turf tires. After rotating the mower wheels 90 degrees, I couldn't just slide the deck straight out, perpendicular to the tractor. Like you mentioned earlier in this thread, you have to jockey it around some to get it to clear things.
These dollies aren't that much bigger than the mower wheels. I took one of the wheels off my deck, and have attached a picture looking down at it sitting in the dolly, and also looking across at it sitting in the dolly. As you can see, by the shot on the left, the footprint is only marginally bigger. And, since the tractor tires are round, there's more distance between them as you get closer to the ground. The shot on the right shows that the dollies sit nice and low where you get the most clearance between the tires.
I think I'll start a separate thread for FEL moving, since its a different topic than MMM wheels.