Need tcase part number help
I am replacing some seals on my 1989 YJ 231/tf999 combo this weekend. I am trying to have the parts required so I don't have to run to parts store. I am replacing the rear tf999 seal and I would like to replace the tcase input shaft seal while the tcase is removed. I went to autozone and they had the choice of a single lip (part 3173) and a double lip (part 710928). Which is the proper seal?. Also, does anyone have the part number for the shifter seal on the trans? I have read that this is a known problem area for leaking. Thanks for any help.
1989 YJ, 4.2/TF999