I spent most of the day cleaning 40 years of dirt and grime off the rear end of the 67 today. The gears and everything looks great and I am planning on painting it for the rebuild of all the suspension components in a few weeks. I thought I'd get a shiny new cover and checked around just to find there are lots of choices ranging from about $15 for a plain chrome one, to around $90 for a finned aluminum unit with a drain plug. Since the rear end already has a drain plug this means little to me. The question is, is there that much of a difference between these, or will a $15 chrome metal cover do the job just as well as a finned aluminum unit? Are there leak issues with the cheaper models? What are your thoughts?