[kaptain]

Hi hopefully you have figured out which air bags and what the replacements are as i have  coach 707 and it has the same bags and will need to replace eventually. My understanding is there are 3 different sizes on the coach according to a Tech at Newell but i have no idea what the replacements are so would love to have the part numbers  for them if and when you get all that figured out. I am sure there are others that would love to know as well. Thanks so much Robert Austin

Yes, I was able to figure out what airbags (aka air springs) were on my coach 701.
Drive Axles:  4x Contitech 782N (782NP04, Contitech order# 74340)
Rear Tax Axles:  2x Contitech 661N
Front Axles: 2x Contitech 876N 

2 airbags on drive axles have to be replaced on my coach. I initially asked Morgan at Newell what part number I should order to replace 2 airbags. Morgan said he's not quite sure what airbags are on my coach, as 701 is one of the early adoptions/transition to ZF suspension. So I asked the repair shop to send me some photos, the prints on the rubber were faded so much it's hardly readable, but eventually, I was able to figure it its Contitech 782N. So I went back to Morgan, he says Newell no longer has 782N airbags, he said he can offer a substitute NC#708440 at $678.60/each + shipping. I asked him if this can be a direct replacement without having to make any mechanical modifications. He said the tech might have to drill the center hole on the chassis. Lacking any datasheets on NC#708440 to compare with 782N, I decided to contact Continental (the maker of Contitech air springs). Contitech salesperson says this 782N style is not sold in North America, only in Europe. Continental can get from their sister company in Europe, but the lead time would be 6-8 months. So I end up buying that in Germany myself and having the airbags shipped to me. I expect to receive the order tomorrow. Paid $195 EUR/each, plus $130 UPS shipping.
Later I found a supplier in Poland that sells it a little cheaper, like $130/each, and even cheaper from a Chinese supplier like $50/each but with minimum order 20pcs.
My coach 701 has been at the repair shop for 5 weeks now, waiting for these airbags.

Please note 782N (or equivalent) is available for eBay and other sites for like $30 - $40/each but these are rubber sleeves only, not a complete airbag assembly.
You probably have to buy the complete assembly (includes metal base plates, piston, etc), because that's what the repair shop told me.

For complete assembly, you need to order part number 782NP04, or Contitech order# 74340