Hello,
very good that Jensen sells the fireboxes with the brick imitation as a spare part. This is actually not good at Wilesco. Especially the fire chambers are heavily stressed with frequent use. However, with prudent use of the machines, this should not be a problem. My problem with the brick immitation plate is that I need it for a pair of my 90+ year old Doll & Co. Machines. This then becomes difficult to impossible. I did locate a company in Cologne, Germany that could make the plates for me, but at what price. With my small purchase quantities unaffordable.