Need help locating a simple exhaust part

[Heavy Metal Doctor]

Here's the info:

92 Sentra 1.6L w/ Manual trans (don't remember XE, GXe or whatever)

This is my commuter / beater car so, I don't want to put much cash into it. I discovered the exhaust pipe just infront of the Cat is rotting out and I have a complete exhaust from a low mileage (90K) wreck that still looks nearly new to put under this car for free.Now the problem - this car (and the parts donor, same car only auto trans) has and old style flexible spring loaded "ball" style joint just behind the engine. I just need a stupid 4 dollar seal to go in it, but it appears all the parts places now sell a complete pipe from the Ex. manifold to the Cat. with a flex pipe welded in that location like all new cars use.I'm trying to find a part number for that "doughnut" type seal and buy just that. I can't really tear car apart and carry the old seal around town searching for one for very long, so I'm hoping someone here may have an old parts book handy that shows the old setup and I can get a number.

I even got a pic for reference:



Thanks In advance for any info!