904 shift selector seal

I`ve got a leak at the shifter selector on my 904. I have two new seals, one quarter size, the other dime size. Can the seals be replaced with the transmission in the car? Does the valve body have to come out? I have a seal removal tool that a friend loaned me. It appears that the larger seal will come right out the top. I don`t know about the small seal. Anybody done one of these with the trans still in the car?
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