Sky quad LNB for older versions of the Sky dish. This LNB is no longer manufactured and is now in very short supply.This particular version of the LNB is different to the new MK4 type as it has a slot in design.It will fit into dishes with a completely rectangular section LNB support arm.Early versions of the dish had two support arm sizes:30mm x 20mm section – SKY MK3 dish25mm x 18mm section – Very early SKY dish version manufactured by Grundig & CambridgePlease have a close look at the detailed pictures to check if this LNB is suitable. It will fit both of the above dish versions as slot in adaptors are supplied.The LNB is also suitable for Zone 1 (45cm) and Zone 2 (60cm) dishes. The only consideration is the dimensions of the section of the LNB support arm. It should be rectangular with all 4 sides present and have dimensions either 30mm x 20mm or 25mm x 18mm.