Front forks question

So. I have three vf1000f’s. Two salvage one on the road. Looking to do front fork seals and bushings but I notice two sets have Showa part number mb6-771, while one set is mb6-611. Now the bike thats on the road has the mb6-771 number and its production date is 09/84 making it an 1985. Says so right on the vin tag. Any on know what the difference might be?

-771 are 85/6 forks and have different oil lock pieces and are a different length to the -611 which are 84

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