Torq converters

Will any stock torque converter fit in the same tranny?

Is there a difference between years?

I know the engine in my '65 is a '67 273, not sure about the tranny. Does it matter what year the torque converter is to fit into this tranny?

I was told that my converter may be cracked, because the tranny leaks like a sieve out of the front. The previous owner said that it is the front seal leaking, but I'm having my doubts. My mechanic friend says that it is quite common for the TC's in 904s to crack.

Anyone have experience with cracked converters?