Transmission service question/ pan

[Jeepwm69]

I've got a 95 GMC with 350/automatic and the transmission fluid has never been changed. ODO shows 48K so I figure it's due. I know I have to drop the pan, and I figured WHILE the pan is dropped, why not add a drain plug where next time I can just do a couple of simple drain and fills to get some new fluid in there.

So, are all 4l60E pans the same? I notice some say "late model" and there are apparently some OEM deep pans with drain plugs. I was wondering if one of these would fit my truck?

http://www.ebay.com/itm/4L60E-GM-Tra...#ht_631wt_1170