Gerst Tubular Suspensions

can we change the coils for qa1s? That's what I run in the rear so I would want to keep it the same. What do the brakes in the basic kit look like? I am torn between the two. How much drop are the spindles? I saw it mentioned only allowing for 1 in lower or higher with the vikings.

Best bet would be to contact Carl directly, I honestly don't know.