Front Servo Question

oldkimmer said

..............Absolutely use both front servo springs from the 69 tranny..........the TF-2 will most certainly have bind up/overlap if u don't......I mostly use a 3.8 lever.......kim.........

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Whats the difference in the way the trans "acts" between the early and late front servos? Thanks!

Also, should I go ahead and replace the sealing rings while I'm at it? Where would I even get those?