Item 1752, 1754 and 1756 have been replaced with 1751 (6qt), 1753 (15qt) and 1755 (32 qt).
I have an AP rack that has some 1754 tubs (came with it) and I needed more and so purchased the 1753 tubs. They fit, but are a bit snug - they are a little harder to pull out/push in than the original 1754 tubs. I got them at Target for $3. I have no experience using the new 1755 tubs. I too just broke the purple handles off. It leaves a small gap, but I have some less then 1 month old ball babies in them and there's absolutely no way they can get out.