[Guy]

Here are some photos from our air bag change out.  We had an inspection at All Aboard America in November and none of us saw anything but very mild checking,  The checking was not obvious until the bags were  fully extended  even on the bag in the photo which had blown out.

Notice that there is one stenciled digit in question in the photo. I was not able to enhance the number with cleaning of the marking. Coud have been 9039 or 9089, but

Tom's post in this thread of March 29 nailed our part numbers down.

I am keeping a slightily used 34 year old bag as a spare until we replace the front bags. If you need any measurements or photos let me know.
Be sure to have them change the lines to your brake chambers. Replacement DOT fittings and line was 35 dollars in total, with 1/2 hour labor 

As Tom said,  I also found the bags to be available between 110 amd 175 on the net. 

As I am usually 90 days behind whatever Clarke does, I was recovering from a hernia operaion, amd not able to try to deal with the blown air bag. Our bill had about a 60 percent markup on the bags, plus 6 hours labor at 110 per hour, including fab of the DOT brake chamber lines.  I was very happy to have the problem solved for me.