Replacment airbag?

Hay trying to help a friend find an airbag for a 70s era flatbed and we the loves and the TA are all stumped. Got a part number goodyear b12-439 and its replacment goodyear 2b12-439 is also no good and we are trying to find a cross refrence since its an obsolete bag from 1990 according to the sticker and no longer made. It just comes up as obsolete number "do not use" in the systems we checked that even show the bag

Anyone have a lookup chart or computer they can check for a cross ref? Mine doesnt even show the bag at all.

 

His is a double bellow and this is a single. Will that matter any?

 

Yup thats the one he was going to order. He just was hopeing there was a replacment he could get before monday. The 1r12 didnt fit way too tall at minimum compression. He just got the trailer and is trying to get it home with a new bulldozer lol.

 

No worrys. And yea hes likely sitting till monday at this point. Thanks for looking though! This is the problem with near 40 year old parts lol finding them is a pain.

 

I think his plan is to put new axles under it and use it as a dedicated equipment mover for stuff like the d4 he just picked up so he is not ripping up his lowboy.