Alternator mounting, '69 and earlier vs '70 and later 340/318?

[69_340_GTS]

Are the brackets and other hardware to mount the alternator the same for '70-up versus '69-down small-blocks? I'm wondering since the water pumps are different. Also, who sells these parts new, or did they stop reproducing them? I know I've seen them for sale in the past.

 

[Dana67Dart]

Cast iron WP vs Al WP require different brakets. I believe both are available form places like Classic Ind. Etc.

 

[cudamark]

There are also A/C and non-A/C versions too.