You need the Ford unit..The TRW style was used on the Fox Body style Thunderbirds..
Normally I wouldn't tell somebody to do this, but since this is your only vehicle here's a little trick you can do to get you by until your new Rack & Pinion arrives..
If your rack is leaking at the seals, and dripping out of the bellows there's a way to slow it down..
When your Reservoir starts getting low again..Run half Brake Fluid, and half Mercon V..
The Brake Fluid will cause the seals to swell thus slowing or stopping the leak completely..
This is just a temporary fix..So get your Rack fixed ASAP!
1991 Ford Thunderbird Sport
"If you don't know where you're going..Any road will take you there."
– George Harrison