Begin by looking at the photo of the gourd. Note that in the neck of the gourd, you will see a hole. This is the hanging the hole of the gourd. This hole is large enough to accommodate a 3-8" gourd arm. Also take note that the hanging hole is drilled front to back in the neck of the gourd. When a hanging hole in a gourd is oriented front to back, it is referred to as a "Horizontal-hung" gourd. Gourds whose hanging holes are drilled the opposite way (left to right in the neck of the gourd) are called Vertical hung gourds. An example of that would be the SuperGourd.
I looked up the gourd rack you mentioned and it appears to me that the gourds would need to be wired on. If that is the case you would find it easier to use a SuperGourd or a "vertically-hung" gourd. Still have questions, reach out to us using the contact us page.