Where do I get a 2405 diaphragm, and is the installation similar to replacing an 075 diaphragm (God knows, I've done enough of those in my day)?

Looks like one of the 2405's in the systems I just bought is blown. So, where do you buy the diaphragms, and how much do they usually run?

The crossovers are another problem; missing some terminals and/or broken terminals (one x-over has a nail stuck in it, in place of the terminal).

Thanks for any help you might be able to provide.