I got the racing beat stainless brake lines for my 87 T2. How do I know which is front and rear and how do I put the line holder things on the front? No instructions whatsoever.

 

The front ones will be straight lines with AN connectors on the front (if I remember correctly). The rear ones are the ones with the O Shaped Terminal on them.

The front holder has a clip that keeps the line tight against the mount. Remove that clip by sliding it with a screwdriver or something, and the line will come right out.

With my experience, the RB lines were too bid to fit in the stock mounting holes, and I had to file the mount a bit to widen the space.