As much as I try, I just can't seem to find the s9351!

I need a high tourqe (and speed) servo, at least 130 oz/in.
I am using FUTABA all around so I want to stick to it.

Where can I find that servo? (best if can order by e-mail)
any other servos good for the job?

will hitec or jr (digitals) work with my futaba reciever?

While I'm at it, I am a bit confused,

I'm planning on using r149dp with s9451 all around (6 pcs) with 2* 3000 mAh 6V,
no regulators! Will the servos take it? they are 6V compatible...