You're gonna love the Prothane mounts then... mine idles and rocks like a big block with the 280's, minus balance shafts, and Prothane mounts and sitting in the car feels great
They did actually make a 89-92 GVR4 kit. I have attached a pic of it below. But many places just sell the 1G/2G kit in which instance you will get not get all the mounts you need.
UPDATED: Below I have listed all the parts for Prothane Mounts for GSR/EVO I-III and GVR4's.
GSR/EVO I-III OWNERS - LOOK HERE
1. Transmission mount insert "right upper" (aka the mount at the top of the gearbox) Manual transmission
I have confirmed this mount to have an 80mm inner diameter with a 50mm inner thickness.
The part number for this is a
13-501.
When you install this insert it ends up being 70mm wide. However the OEM gearbox bracket width is 80mm wide. Therefore you have to add the 2 x oem flat black rubber dampers on either side of the mount to make up the full 80mm requirement. Have a look at the attached pic of an OEM EVO III gearbox bracket below. You can see the black rubber dampers on either end of the insert. You need to install these when you install the 13-501 Prothane insert.
2. Engine mount insert "front" (aka the front mount on the crossmember behind the radiator) Manual transmission
I have confirmed this mount to have an 80mm inner diameter with a 40mm inner thickness.
Currently we are purchasing the 13-501 mount for this one. Then slicing 5mm off each half to make it 40mm thick.
I will check with Prothane now if they have an off the shelf item with 40mm inner thickness to save any modifications, then update this thread.
3. Engine mount insert "left upper" (aka the big engine mount next to the timing belt cover)
I have confirmed this mount to have an 80mm inner diameter with a 50mm thickness.
The part number for this is a
13-501.
4. Engine mount insert "rear" (aka the rear mount on the crossmember closest to the firewall) Manual transmission
I have confirmed this mount to have a 70mm inner diameter with a 40mm inner thickness.
The part number for this is a
13-506.
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1989-1992 GVR4 OWNERS - LOOK HERE
1. Front Roller Stopper (the mount in between the radiator and the engine block)
Confirmed this mount to have an 70mm inner diameter with a 40mm inner thickness.
The part number for this is a
13-506
2. Top Engine Mount insert (the big engine mount next to the timing belt cover)
Confirmed this mount to have a 90mm inner diameter with a 50mm inner thickness.
The part number for this is a
13-503
3. Rear Gearbox Mount (the mount at the back of the gearbox against the chassis rail)
Confirmed this mount to have an 80mm inner diameter with a 50mm inner thickness.
The part number for this is a
13-501
4. Rear Roller Stopper (the mount nearest to the firewall under the intake manifold)
I have confirmed this mount to have a 70mm inner diameter with a 40mm inner thickness.
The part number for this is a
13-506
