Inside Trim Boards for 70 series

[Conrad-BJ70]

Anyone knows where can I get hold of a pair of Inside Trim Boards for my BJ70 at no fancy prices? However they must be in very good condition as I need them to make a fibre-glass mould out of them as mine are cracked, thus useless... I am trying to customise the boards in oder to fit a pair of speakers in them...