How can i fix my straightners (Wide GHDS)?

i have bought my ghds off ebay and only had them 3months i accidentally stood on them at the end where you clamp them together, This broke the plastic, all i need is the top half of the ghds to use that plastic and put them together. I just want to no how i can get hold of one? i will pay if any one has any that dont work due to the wires etc. thankyou xx