Simple answer to this one, Losi dont do an 8.5 combo at the moment!!!!
The 9553 number is the 17.5 (which we do have on our site and is also how it is shown on the Losi site too!!) Love to know where Apex came up with that one from.....LOL
(I wonder how many they have sold
)
The new 5.5, 7.5 and 8.5 are all intended to be released as combos soon, but not just yet, I believe they are trying to get on top of the volume with the ones they already have since demand is constantly outstripping supply.