[layback40]

Rear main seal
After being told by many that this seal is unique, I did a little research.
The engines in jeeps use the standard black rubber seal. When the motor is used in other cars, they used a viton seal.
The original seal is 110 id, 130 od & 13 thick. (thanks Mudmonster)
The problem is this is not a standard size.
After investigation, I found that 110 130 12 is a standard size. it has the dust excluder as well as the main seal ring. The 1 mm thinner seal will make little or no difference to the operation of the seal.
The viton version is stocked in Australia, there were 12 in Brisbane today showing on my bearing guys computer. There is one on its way down south to me now.
You should be able to get one for around $70 depending on how much discount your local guy offers you.