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McHenry makes a number of couplers for the AHM/Rivrossi/IHC cars.  The originals simply pull out and the McHenry's snap in.  Takes less time to do than describe it.  Look for the newer kind with a knuckle springs, the early wisker spring knuckles hold up poorly. Most of the heavyweights take McHenry #53.  As noted above Kadee makes a conversion kit for the AHM cars.  It takes a little more work, but also works very well.   They're a real life saver where someone has broken off (improved?) the nub in the truck the original coupler attaches to.  The KD instructions say to use 36" replacement wheels to get the height to come out right.  If you use 36" wheels you may have to pare a bit off the brake shoes to get clearance.  My heavyweights are running with 32" wheels cause it's what I had on hand, and they seem to work fine, though 36" is more correct.  BTW, although they don't advertise it, the McHenry #53s work great on the various AHM, etc old time cars. Hope this helpsJBB
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