Hello,
You are correct! The operator you have here does appear to be the 39-239B Encore Awning Operator. This is also available in a stainless steel version, part 39-239C. Both of these operators are sold with the 39-558 Truth Detach Clip attached to them, however, they are available individually in the event you wanted to purchase extras.
The colored part on your operator is the operator cover. If it does not pop right off, with gentle force, it is very likely you have an older model and it is not removable. The good news is that we offer two different replacement options that are available in an assortment of colors. They are the 39-375 Encore Truth Folding Handle with Cover or the 39-451 Encore Truth Operator Cover and Handle.
The black plastic pieces on the end are sold separate and will need to be replaced with the 39-536 Truth Hardware Pivot Slide Assembly. This pivot slide assembly is compatible with the 39-556 Maxim Awning Stainless Steel 16" Track.
Thanks for posting!