[Daniel Dover]

--- You wrote:
 If
you don't weld, any welder can make them up out of mild steel plate. This is
not a difficult or expensive undertaking, compared to having new legs made,
 fitting leg plates in the new legs and case, and  finishing the new legs to
match the old finish.

For a refinement, measure the separation between the legs in a pair, and have
little studs welded on which fit into the caster sockets. This removes the
need for a lip.

Bob Davis
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I did exactly this on a Colson piano truck a couple of years ago.  The retrofit
worked just fine.  No need to replace legs.  The cost to fabricate three plates
with welded pins was nominal.

Danny Dover, RPT
Dartmouth College, Hanover, NH