Just like the originals. The cover is  glued directly to the hardboard panels to give a smooth, crease-free finish when fitted.
 
These fit over the rear wheelarches in your Spitfire MkIV and Spitfire 1500. To get the curve just right I recommend leaning the panels against a wall and carefully placing a weight in the middle. This will gently bow the panel smoothly overnight.
 
Includes:
2 x Rear 1/4 panels - left & right hand