I ordered replacement lids for my 3 cup rectangular Pyrex and the lids are loose fitting. Customer service was great in sending me replacements but these did not fit either. No problem with the 6 cup or 11 cup lids. I was trying to find white lids, none seem to exist. Decided to replace all of my 26 year old white lids with dark blue and now I have mixed lids and for an OCD person this is unsettling.