I have 4 valve cap extensions on the 2011 Sunseeker. I was able to get my Pressure Pro sensors to screw on these, 2 front tires, out 2 of the rears. For some reason, the sensors won't engage the dill valve stem which is a bit higher than the valve body. I would like to screw 2 more of these sensor extensions on the remaining two stems, I believe they are Alcoa Wheel part number 001-009, factor installed I imagine. Does anybody have any experience with these? Where can they be purchased. There is an Alligator V2B which is very similar but the OD is not threaded and the sensors will not screw on of course.