AJ,
There are metal and plastic repros out there. I went with the metal ones that Brant sells at VA Mustang, they fit pretty well, and were already painted (mine are white). I installed them in repro door panels (Mustang Mart brand, I bought from Tony Branda, I think VA Mustang handles these as well). I haven't actually used them yet (my 69 GT350 convertible is in a million pieces), but the p[ulls seem as thick as the originals, at least no worse. As for the 69 vs 70, I think the difference is in the length of the pulls, and the door panels are different between 69 and 70 as well (I'm not certain whether or not this was a mid year change that would have affected later 69 (and 70) Shelbys, but maybe someone can clarify this). Hope this helps.
Dave