Merely getting the ID and OD for that seal won't cut it as you need the grease slinger that is built onto the seal.
You won't beat MAC's price on that seal. Yes, you can buy it locally under National part number 5751 (if memory serves) , but in my experience the local jobbers wanted $70 for that seal. Last time I looked MAC's was around the $20 mark.
The NSN for this seal (5330-00-286-6873) is still valid. A search shows the US military pay $30.26 each for them.
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