I have to get them from a seal supplier by number, the 3 set number on the seal itself.
They're good seals and are designed for high temp work, but around 2-3 times the cost of std ones.
This is inside diametre outside diametre width, unfortunately not all sizes are available, as mainly used on industrial machinary.
I don't know the seal number of this so can't even say if available.
tabetha