Dryer infrared panels for Phoenix 230 - where to buy them?

I'm new here...I purchased a used Phoenix 230 dryer for what I thought was a good deal. I tested it before buying, it was slow to heat up but pretty clean. Now that I've been upgrading the electrical in my new space I've found that 1, or possibly 2 of the heating elements need to be replaced. Trouble is that they're hard to find, at least as a stock item. Below are the specs. I'd love some referrals on where to look for replacements.

Machine: Phoenix 230 (10' long x 40" wide, 30" long belt)

Panel Dimensions: 12" wide x 30" long x 3" deep

Watts: 3375

Volts: 230/460

See pictures below.