3rd Gen Hemi - gearbox conversions?

As the new hemi's both 5.7 and 6.1 only come with the mercedes auto gearbox from the factory I was wondering what MANUAL gearboxes on the market would be able to be bolted up to these engines. I am aware Keisler do conversions for the new hemi cars but are they only suited to these vehicles?

I am wanting to put the new hemi into my A body 73 valiant charger, I should mention I live in Australia. Is there any gearbox on the market you could buy that would hook up to the new hemi? I am aware the new challenger coming out has a 6spd manual is this a t56? I assume like used behind the new Pontiac GTO's with the LS1/2 which are known as Holden Monaro's over here in Australia.



See link for gearbox mentioned
http://cgi.ebay.com.au/TREMEC-T56-MANUAL-GEARBOX-6-SPEED-SUIT-HOLDEN-LS1_W0QQitemZ190178948475QQihZ009QQcategoryZ102358QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

If it was a gearbox like this it would make the job much easier as these gearboxes are readily available over here due to our HOLDEN COMMODORES/MONAROS have had these gearboxes for the past 9 years or so since the LS1, possibly before that too.

I'm aware the auto gearbox they come with could be made to fit with tunnel and crossmember modifications but if I am going to do that I'd rather have a 6spd manual in there (always prefer a manual car as my fun car) and I know that you can bolt the 727 straight up to them but I'd rather see whats available on the manual scene first.

Any insight/info would be great.

Cheers, Dave