A couple of questions

[smn69]

OK guys, I have a few questions for you. I am getting along pretty good on my 69 longbed. I have rebuilt the engine, completed the front disc brake conversion and front 4” drop. Replaced all the ball joints tie rod ends and front shocks. I installed the rear 6” drop springs today and I am waiting for my shock relocation kit and my adjustable track arm bar.
First question: If I go to Auto Zone to by rear shocks, what do I need to ask for to get shocks to match up with the 6” rear drop or do I need to order drop shocks from one of the online vendors?
Second question: how should the rear track arm be adjusted(does this need to be done on an alignment machine)?
Another mod I am going to make is an electric fan. I have read the thread in the FAQ section about the fan from a 2000 Grand Cherokee. Seems like a great way to go to get an electric fan setup. I have called a couple of jeep dealers and they are quoting me $400.00 just for the fan. The tread mentioned (this was last year) that the dealer price was only around $70.00.
Next question: does anyone have a source for the Grand Cherokee fan?
Last question: I am also waiting for my rear gas tank, any special things I need to watch for when I install it? (modifications to the frame, cross-members, ect)
Thanks in advance for any advice.