This SL-58 / SL-59 Hip and shoulder upgrade parts (specially designed for POTP Rodimus Prime / Rodimus Unicronus) are brought by Shockwave Lab (3rd party transformer studio focusing on upgrade kits) , it is to improve the the combiner modes of the two POTP Rodimus.
The whole set includes:
2 x upgrade parts for shoulders (Rodimus prime mode)
2 x upgrade parts for hips (Hot rod mode)
3 x knee rachets
Buy as much as you like, and I will send you an invoice with a combined shipping quote!