1983 Blaze King Princess Combuster

I have an older model Blaze King Princess insert. It was manufactured in 1983-1984 and has a model number of PEI-1200. I am trying to figure out which compuster to put in it. Currently it has a round 6x2 combuster but websites say to use a 6x3 on early models. My stove manuel lists BK part number 4400 for the princess combuster and 4500 for the King combuster. So I assume they are different.

Does anyone have a princes early model like mine (I assume free standing Princess' used the same combuster) and know what combuster to buy? I purchased a 6x3 but then found it was different then what is in my stove. The 6x3 does fit however so I am not sure if it would work.

Thanks for the help.