My Eljer 141-0220 tank cracked. The bowl is fine. Can I replace the tank with a different brand or style? Seems this tank is hard to find locally.

You can find tank on amazon. take a look here Amazon com Eljer tank enjoy

I would first try to purchase a replacement tank for your product. Visit your nearest Eljer dealer with your product number and find out if the tank is available as a single piece.

You can locate your nearest dealer using the on-line search function:

http://www.eljer.com/dealers.aspx

Alternatively you can Eljer directly: 800-442-1902, Monday through Saturday, 8:00 A.M. to 6:00 P.M. EST.
Your toilet is still listed as available on the website so obtaining a replacement should be possible. Trying to match a different tank and ending up with a leak would create more problems that anyone would want.