Where to buy Cross Bars for tent?

Hi All, anyone know where might I be able to buy extra cross bars for my tent? I'm looking for 24" inch cross bar with hooks.

see here:

bump

I ended up making mine with pvc when I needed some, good post !

I got a 1 x 2 piece of wood cut to the proper length
and 4 of these pipe clamps

I screwed 2 of the pipe clamps on each side of the 1 x 2
make sure you measure the lenghth of wood correctly keeping in mind the clamps on each side so it will fit nicley.

hmm smart. wish i had the cutting tools.

I'm going to try and ask the tent manufacturer for spares.. I found their # on the box. hopefully they will send me some. otherwise, i will consider DIY