Power Distribution Block Mounting

[Karma]

It was brought to my attention today that we need to include the power distribution block in the electronics this year. While I understand the motives be hind it inclusion of this new part, it is redundant and too heavy to be worthwhile on out robots. In any case I was trying to put it together but I could not figure out how. I opened the plastic bag that it was in (right out of the kit of parts) but there wasn't a rail or anything to mount it on. The pieces do not stick together like legos or connect in any way I could figure out. Any help would be appreciated.

EDIT: I found the DIN rail in the KoP, sorry for not looking throughly enough.

EDIT2: Does anyone know if I would be able to drill holes into the power distribution block and DIN rail (without interferring with the internals of them)? I'm over my alloted weight for the electronics and I don't know if there is any way to take off more weight.