Cocker cupseals will work. They are ALMOST the same size.
Now, i'm not sure if its only the pre-99 cockers, or all cockers. I'm not a cocker expert.
But since people would often swap out the factory seal for a fancy aftermarket version, the stock ones were often thrown out, or sold cheap. So, it doesnt hurt to lurk around the BST for a cocker cupseal.
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