Since Murray went through bankruptcy and the assets were acquired by Briggs & Stratton, support has been spotty at best. Briggs has made it clear they have no interest in supporting older legacy Murray or Noma equipment. They bought Murray's assets to protect their open receivables in bankruptcy and to use some of the designs to complement the Snapper and Simplicity product lines purchased about the same time.

That being said, the bag assembly you need is 24087A or 24087MA which show NLA. The assembly in turn consists of:

71094E896 Bag Support @ $42.86
043666E701MA Frame @ $86.34
071589MA Cloth Bag @ $48.68

All three components are available. I used ereplacement parts for pricing; Outdoor Distributors was cheaper for the frame, but more expensive for the bag. You might be able to trim another 10% to 15% from these prices by Googling each part number.