Yup, mercruiserparts.com is the place to shop. I am the member Formula31 spoke of that Marc at BAM just lent his gear case thread chaser to. Sent it to me no questions asked. I would have been screwed without it. Has been helping me practically daily (I think I starting to annoy him) to get it right, and has tons of practical experience he has been willing to share with me. Best "value added" parts house I've found.