Sure you can make a tracker bar.  There are two offset holes in the
Wurlitzer 125 bar for drums.  I remember those new band organs sold by
MacKinnon in the 1970's made by a firm in Fargo North Dakota.  They took
solid brass bars and drilled the holes in them.  Then they took a round
nail set tool ground square to make the holes square.  Solder your
nipples on the back.  We used to buy nipples from a supplier in New York.

Charles Ramsey Company may be able to help you at 914-338-1464.  They
made tracker bars at one time.

Don Teach
Shreveport Music Co
1610 E. Bert Kouns
Shreveport,  LA  71105
dat-smc@juno.com