Walbro and Bosch are both good. The Walbro kit includes a new strainer, which has to be sourced separately for the Bosch. The Bosch is a more modern turbine type pump, and with it you can eliminate the little pulse dampner thingy that Ford installed with the Walbro. Just get the stock pump replacement kit, and it will fit your existing bracket just fine. Upgrade pumps don't fit the bracket properly, and there is no benefit to them on a stock car.
With these cars now 20+ years old, I think it is silly to try to shortcut the process by cutting an access hole in the body underneath the rear seat. Presuming you have a good set of jackstands, after you siphon as much gas as possible out, it is about as quick to drop the tank as it is to cut that hole. With the tank out, you can give it a good cleaning with Purple Power, and get whatever crud has collected in there over 20 years out. Put in the new pump, and then you are all set with a nice clean tank and new pump that will go another 20 years. You can also check all of the various rubber hoses to make sure none are deteriorated.