Just so the original question doesn't go unanswered...
From the ORD 9 SNL G-742 parts manual; Fig. 14-1, item BB: Part No. 500044, SEAL, oil, type ML, 1-3/8 x 1.832 x 7/16.
Now, 7/16" would be extra-wide, for that size of seal at least. Best if you could get an OEM repair kit, which would...