go to your local wreckers and search for a MX32 or MX62 they have a power steering box that will be similar to your existing steering box. i have measured these to go into celicas and they are VERY similar but unconfirmed if they are an EXACT fit.
what engine are you running?
if its an 18R-C then you will have to find a power steering pump and fabricate a bracket to mount somewhere and integrade the belt. then go to pirtec and get some lines made.