which type of Cobra dye sub ink is suitable for a Brother printer?

I know people have and are using Brother printers for dye sublimation. I've been using one, a MFC-475DW. Most of the Brother printers have Piezoelectric just like the Epson printers.

During my experiments and learning process about this business, I have been buying cheap generic dye sub ink from Ebay. It's worked well but I'm not getting colors as vibrant as they should be.

So I wanted to try a better quality ink and contacted Cobra to ask what the 4, 4.1 and 4.2 specifications on their dye sub inks signified and asked which one would be suitable for my Brother printer. I just got back a canned reply that they only make ink for Epson printers.

But again, with the same technology in the printheads, I've had perfect success using Epson inks in this printer before I started using it for dye sublimation. I've read experiences from others that get the same great results and have not read about anyone NOT getting the expected results when using ink engineered for an Epson in most of the models of Brother printers.

When I Google Epson and 4.0, 4.1 and 4.2 the only results that show are feedback ratings in those numbers. I can find no information on how those numbers relate to the ink and/or Epson model numbers. The 475DW is a 4 cartridge printer, CMYK so I just need to know which ink would be most suitable to use. I'm not expecting Cobra to warrant their ink in this printer. As far as generic Epson dye sub ink, anything that has stated it's for Epson has worked flawlessly (again just colors a little duller than they should be). Even some other companies that claim to make their own ink stamp just 'Epson' compatible. Cobra is the only source I've found that claims to make 3 different types of dye sub ink for ink.

So any suggestions?