I bought mine from Performance Nissan:
http://www.perfnissan.com/parts.shtml
They beat Courtesy Nissan prices big time:NISMO Engine Mount -(LH) $70.15 NISMO Engine Mount -(RH) $70.15 NISMO Transmission Mount $40.15
Excellent customer service and fast shipping! I also got the NISMO thermostat from them too.
For the install, I simply jacked the transmission housing from underneath. It gave me enough clearance to switch them out.
Previous posts on FreshAlloy on my experience:"Just letting those interested know:
I filled the exterior of the NISMO mounts w/ construction grade poly. The car shaked like a MOFO, way too unbearable.Going straight NISMO, I'm not that hardcore. It was beautful to see a KA-T rev to 6k and not budge!
Chipping the poly away, I found that one of the mounts was filled with liquid. I thought they were supposed to be solid? Nissan Motorsports is contacting Japan on that issue."
Next post:"Chipped the poly out and the car feels close to stock w/ the NISMO mounts. It does rock but it's a good compromise between the rock solid mounts and OEM mounts."