URGENT Search for Replacement brushes / heads:...

Question

I recently came across a Braun "Ultra Plaque Remover" Electric toothbrush handset (Timer Type: 4 713 Braun 922 NC - Accu) and a Braun "Plak Control Ultra" (Type: 4 713 Braun 145 NC - Accu) which have been redundant in a cupboard for years. They both get charged on base Type:4728.  I went to Boots & Superdrug to get replacement brushes / heads but none seem to fit as developments to handset and head have taken place since.Which brush head in your range (or Oral B) will still fit my handsets without having to replace that too?  I look forward to your prompt reply. PS there's not a remotely relevant  product code below. Does that suggest the product is no longer manufactured??Thanks Esther