Here a cool site with lots of diagrams:[Link: the12volt.com]

Here is how to decipher how the numbers corruspond to contacts:[Link: the12volt.com]

I still beleive that sound engineering requires you to interlock the coils so that it is impossible to activate both directions at the same time. Remeber if you use a change of direction as a brake you will probably fuse the relay's contacts. Hence, my advice use TPDT