KD tool #3087 worked well for me.

http://www.napaonline.com/cgi-bin/ncommerce3/ExecMacro/NAPAonline/search_results_product_detail.d2w/report?prrfnbr=15612373

I don't really understand why you have to remove the rockers, however. I'd think you'd be able to turn the engine well enough after removing the plugs.

Some more info here: http://www.pindelski.com/