That would have been a series 40 blade which became a deWalt series 40 (there was a 48t I believe, I certainly have a few in 180 x 30mm 48t blades for a Hilti saw). Maybe worth looking on eBay for one as DW no longer seem to list thicker 165mm blades. The other alternative might be to get a Bosch or Festool blade, 160 x 20mm and get it rebored. Festool (and compatible blades for the TS55/TS55R) have a 2.2mm kerf whilst Bosch used to list 160 and 165 x 20mm blades with a 2.5/2.6mm kerf. Lastly Irwin list a 165 x 30mm 48t blade, but it is -ve rake and I don't know the kerf width