buy it with the grease nipple option and also go straight to an engineer and ask them to machine the plastic block to accomodate two oil seals at the ends. if drilling to put a pinch bolt in: don't do it anywhere except right around the back against the mudflap as the screw will be knocked off by the shock on a G-out at anything but the back position.
If buying one for the bottom I would also consider one for the top joint if they do one.
regards
Taffy