Looking for mulch bag for a B&D MM525 type 4 electric mower
 

I recently picked up an old Black & Decker electric mower model MM525 type 4. It works great but I am trying to find a mulch bag for it. Apparently, the model is so old that neither B&D nor any online part suppliers that I found carry the bag any longer. I can wait until someone somewhere throws away the same type of mower with a bag and hope that I get it before others will. My question is this: are there bags for other makes/models that might fit this mower?

Thanks much