Where can I find matching plinth replacement

This is a follow-on to the Miele dishwasher query. One way or the other I now have the opportunity to replace a 5 cupboard width stretch of plinth that has become very discoloured being partly beneath a dishwasher. I have attached two pictures of the kitchen cupboards. I think this is a fairly common type. The plinths are made of MDF with some type of veneer/covering the surface of which has blistered and although looks ok in the photo does not look it to the eye.

Any ideas on where I could...

Where can I find matching plinth replacement