The manual says 81190 for machines prior to 1-1-01 for both the boom and crowd. After that date it would be 81222 for the boom, where your machine falls in. With that in mind, take a good look at the boom cylinder, it might be the same as what you need for the crowd. Not knowing, the difference could just be the cylinder rod diameter. Now with that info, you might be able to find it at Surplus Center.
Dart1917 gave you the dimensions you need. 3" bore, 1 1/2" rod, 24" pin centers closed, 40" extended. Cross tubes are 1 1/4" bore, butt end 3 1/2" long, rod end 3". These should match you boom and be very close to the crowd cylinder size since it was replaced.
I'm curious, How do you bend a Crowd cylinder rod?