11 = Deluxe wheel covers
5 = painted wheels
The steel wheel came two ways, painted body color for poverty caps like mine or black for full wheel covers thus the X9 on your sheet.
Well it should be a dog dish style with Plymouth stamped on them. If you look in the PDF in information. Should see it. I have a classic industries book and it also shows from 69-70 the same ones. You can surf the web and look in classic industries. Hope this will help ya.
The only thing from Chrysler I have been able to find is this.
View attachment 26885
It shows a true "wheel cover".
But I do see it is 1968
This begs the question for 1969.
Would Chrysler have used a dog dish "hub cap" for a deluxe wheel cover option?
From the Classic Industries catalog like you said.