Britax Child Cup Holder

I bought this cup holder for my britax boulevard CS and it does not work because there are no slots in the car seat for it. I called Britax and it turns out that the boulevard 70 and 70CS will fit. NOTE: The britax boulevard will not fit. Apparently, the 70s series are newer.
On the box of this cup holder it states it will fit: roundabout 55, marathon70, boulevard 70, boulevard 70CS, and advocate 70CS.
You can find out the exact model of your car seat by looking at a label sewn on the car seat cover at where the child's head rests.
You can also check underneath the sides of the car seat for slots, after lifting up the car seat cover.
Too bad... it would have been a very nice addition. It is a simple, nice cup holder.

Apparently, there are many versions of the Child Cup Holder. This model, the S844800, is not for the Britax Advocate 70 CS as the item description says it is. If you called Britax customer support, they would tell you that you would need to get the S850400 for the Britax Advocate 70 CS. Additionally, there are different versions or "years" of the actual seats. The S850400 only works on the Britax Advocate 70 CS models that are manufactured after the discontinuation of the Britax Advocate CS (note the distinction by omitting the number 70). They stopped the production of the Britax Advocate CS sometime in July or August of 2009 and then began to make the new and updated version called the Britax Advocate 70 CS (note the distinction of the new seats by adding the number 70 to the name). Now that I have confused you to a fantastic degree, know this: If you call Britax with your car seat information, they will tell you which of the several versions of the cup holder actually fits...Read more

It seems this has a really low rating because the customers didn't check specifics to see which model seats this fits. It clearly is only for the new 70 models, not the older ones. My son loves being able to put his drinks away and still reach them (barely though, he is very small and short for a 2 year old).