Most queen sized air mattresses are 60 wide X 80 long (some are slightly shorter).The best I could find to your measurements are 60 X 74 from Walmart. Even most twin sized air mattresses are 75 inches long, so putting two together wouldn't work. You'll either have to see if 4 extra inches in length will work, or do some work to shorten it, or the more expensive route is to find a company that may custom make one for you (but I'd hate to see how expensive that would be).
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Air mattresses come in the standard mattress sizes. A 60 x 70 mattress is just shy of a Queen sized mattress. So why not get a queen and trim the 10" off yourself. Just a matter of getting the correct vinyl glue to put the mattress back together. Not that its an easy thing to do but it can be done.
+1 except fold the excess over and clamp or glue the fold instead of cutting it off.