You may want to verify a few things before you go headlong into this project.
To begin a side shift hydraulic function is consider a low hydraulic oil volume function versus a paper roll clamp which is consider a high volume. Depending on the manufacturer & model of truck you have. When a side shift is used some will install restrictors to reduce the volume of oil delivered to the side shift cylinder or they will have a low volume valve section compatible with low volume attachments. Secondly, the hosing & pulleys maybe size for a low volume attachment like a side shift - typically #4 hoses, where as paper roll clamps commonly use #6 or #8 hosing to delivery satisfactory performance (speed of operation).
I suggest you first contact the attachment manufacturer to help you with what they require as far as oil delivery (GPM) & then the truck manufacturer/dealer to sort out the valve, hosing and pulley requirements.