I have a JD 5205 with a 521 loader. It has joystick loader control with two midmount SCV's and one rear SCV. I plan to utilize the rear SCV to operate a grapple on the loader bucket. I need to add an additional rear SCV for another attachment. Is there an option available to have the grapple control lever located close to the joystick control? Also is there a source for aftermarket SCV's?