Indislider question
 

Just bought a Manfrotto 351MVB2 tripod with a 503 hdv head. Which indislider to I buy for this model? Is it just the Indislider Pro 36" or do I get the Indislider pro with bogen adapters? Can't figure this one. I went to B&H and the sales rep told me with this particular model that I have I can just buy the Indislidr pro 36". When I get home and took the head off all I have is a bowl on the sticks and the head had the thread. To get the Indislider that is 36" for $499 you need a tripod that has a flat plate with a threaded bolt sticking up. I don't have that. Is there a certain way to take the head off? I unscrewed the bottom of the head that helps you balance out the head even though the sticks are not straight. and then the whole head came out. Is there another way to remove the head off the sticks? check out www.indifocus.com/products