If you look at the tray selections in the website you will see tray numbers followed by a letter suffix.
The letter suffix is to denote the depth of the tray as we now offer most of our trays in a range of depths.
A = 25mm deep cut-outs, B for 40mm deep, C= 60mm deep and D denotes 95mm deep cutouts on the tray. The overall depth of the tray is denoted in the descriptions.
A number of the trays are stock items, some of them will be non stock items and require a delay in despatch to allow the trays to be cut.
We have moved to this way of offering trays as we like to give as many options as possible to the customer.