If I order a PSA with Option 215, are there any additional hardware options required for the PSA Option 215 to work?

All the accessories you need to connect the source to the PSA are included, such as the cables and feed-through. However, it is strongly recommended the you also order Option 015 "6 GHz Return Loss Measurement Accessory" kit. This kit provides the accessories you need to perform return loss measurements and Open/Short calibration below 6 GHz.