I saw an earlier post that was too old to reply to and I have the same problem, it's an Everest white uPVC door, very solid and fitted in 1993, the bottom white moulded panel has discoloured a little, something I believe Everest infill panels were prone to at the time and it is most definitely 32 mm thick, not 28 mm. Can 32 mm be found anywhere? Or can 28 mm be made to work? I suppose I could ask Everest, but I was trying to keep the cost down.