1969 M375 Rear air bag kit

[turbinebronze]

Hi gang,
  I want to buy helper air bags for my '69 M375 Travco.  (She likes to heal over in cross winds..)  The closest reference I can find is it would be a M400...but the listing I find for air bag kits start around 1972-73.  Is this the same chassis? Will a kit for a '73 M400 fit under a '69 M375.
  I don't think Dodge changed things that much...
  I did do a search, and this is the closest info I could find.
Does anyone know for sure...or do I pay my money and take my chances?  Hm?

    Craig