Hi Bill, Are you in the States or Scotland?
As Evan has said it is not necessary to remove the pin in order to replace the seals. I was merely answering your question.
Seals should be readily available from any hydraulic supplier. Try and remove the old ones without damaging them. There should be an identifying number or size on each one.
Be sure that you take not of the way that the seals are fitted so that they can be refitted correctly.
Let us know how you get on.