What's the Proper way to mount my shocks?

All right, this is probablly going to sound stupid. But which way do I mount My shocks. These are going on My 59 Chevy truck (if that makes a differance). Is there an up and down to these shocks? What end do I mount to the frame bracket and which to the axle, front and rear and why do they need to be mounted that way just out of curiosity?

http://www.classicperform.com/Store/1947_59_Trucks/DT4809G.htm

 

Btt

 

The fat end is the bottom. On shocks with a tube covering the top, this is so the tube doesn't fill up with shit and bind the shock solid. On a shock without a tube cover, the valving may or may not be affected by the mounting direction.