Shao,
Those might be hard to find. I use all my 802 brackets and would never part with them. Maybe you can special order them through a lfs or something.
One thing I do to help support the 802s on the bracket is to put some Lego between the PH and the back glass. This also serves to keep the PH level with the water's surface so I get better surface agitation and more gas exchange.
Sorry I can't help more than that
