I went and checked out the bags today and this is what I found on my 2005 Holiday Rambler Endeavor 40DST on the RR8R chassis.
Front air bags were double convoluted Firestone 20F-2 on the bellows which is W01-358-6393 in the catalogue.
The rear air bags were reversable sleeve Firestone 1T115L on the bellows. Unfortunately this bellow stamp can come in a lot of variants on page 18:
I am thinking by the catalogue that I have either W01-358-8897 or W01-358-9376
I dont feel like screwing around with pulling the upper part of the bag off with that one hard access nut on inside. I guess worse case I can reduce the port to 1/4 NPT.
I reached out to Rev who now sells all Monaco parts and this what they said: (what a joke on price)
'05 Endeavor 40 DST
Double Lobe Air Bag w/ Longer Bumper, Front, part number 10119167, $621.30 each, in stock
Large Rolling Lobe Air Bag w/ Longer Bumper, Rear, part number 10109709, $831.44 each, in stock
You can order parts online at revrvparts.com or call 1-800-509-3417 and speak to any representative to place your order.
Firestone Air Spring Catalogue.pdf