Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially and to my understanding, a new Double Density 720K floppy disk drive is no longer readily available; sorry.
However, this drive has a known /common failure point and the replacement part in most instances is still available.
Would the above information serve your need please?
Additionally, there is now a possible digital substitute that emulates the FDD. Would this also be of interest?