The Tekna 12.5 Jump Gullet Plates Allow you to adjust your Tekna Jump saddle to fit a variety of horses, or one horse's changing shape. Please note: this gullet plate fits the older version of the S-line saddle with serial numbers prior to 120718418. Please measure the hole in your gullet plate to be sure you are ordering the correct plate. This plate has a hole size of 12.5mm. to order the gullet for the newer S-Line saddles with the 9.5mm hole, Click here. This gullet plate will have to be special ordered so please expect to wait 6 weeks for delivery.