Then that could be the issue, Check with the vendors on here. They offer good dealers on OEM parts. Fred Beans subaru, is who most of us use.
I think there may be a DIY on here to cover the replacement too. I know your not the first to need one replaced.
I've had my driveshaft out. It is simple. Only issue may be snapping one of the heat shield bolts. I left the heat shield out 15 month's ago.
174,000+ miles, 5/20/12 new ej257 short block, 8/20/11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. Also CHECK YOUR OIL, these cars use it.