If you search on here , someone has posted what size box section you can get to replace sills. Came across it a while back but it`l still be there .Cheers Uncle Albert, Alas the whole of the sill is so rotten there are
gaping holes all the way along. This is the offside yet the nearside has
been replaced. Why somone only replaced one sill beats me? But my job
seems to just feed the money pit!
R.
Someone shared this link on the forum in a post I saw, seem to have a fairly decent set of panels: Discovery
60x100, i think