I had trouble finding some and when I did it was going to be expensive to do all 4, was cheaper for me in the end going to disc brakes from a 1977 truck
if your srout is the same of the rn20 the ebay http://cgi.ebay.com/ebaymotors/TOYO...r_Truck_Parts_Accessories&hash=item483b59e622
Think I found a good website for parts. www.autopartsworld.com looks to be a good source for mechanical stuff.