hi chris im guessin you mean timber beads which you will be able to pick up at any joinery manufacturer that makes windows and doors, you will probably need some making especially though this shouldnt cost a lot. I have done it once replace single glazing for double glazing but the rebate that was left was tiny i would never have got a bead on so i had to hold the unit in with glazing pins and then mastic the units in.
yorkshire chippie, October 2008
