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The stock BP is 5.5" which comes with your 3401 will work fine with a LC 6.5" pad. To the best of my knowledge there are no 6" backing plates available for the 3401 and since it's a forced rotation unit you can't use a standard backing plate like you would use on a PC, Meg's and the like.
Lake Country makes a 6" backing plate for the Flex.
Rsurfer have you used the LC plates any good? Any down side?