Thanks to everyone for the input. Existing oil is drained and I’m awaiting the delivery of Redline 80W-250 for the refill. I grabbed that Bulletin article and am going to change that to Viton while I’m at it. I looked at the Alternative Parts List and the part is listed as:

55x42x8mm R23 Viton double lip rotary shaft oil seal with gaiter spring.

Will that suffice for a description if I contact Bearing King in the UK to source it? Is there a part number or does the description suffice when ordering?

Thanks again for the much needed help on my end!

Will