Dinoslmn,
If you tried to get 60 feet of wire on that size shuttle, by the time you used 40 feet of it, you'd no longer be able to get anything thru the center of the toroid. It only takes 30 feet of wire total...sorry.

As for the availability of those toroids..after I told you about them with the part numbers the next day they were sold out. Other sources for that size might be from an old AT sized computer motherboard. They usually have 2 of them on the boards. Most of them are perfectly sized for our projects. I've been looking for the same ones for awhile but no luck unless you want to buy 500 at a time.

John