So now that I've decided on Zimmerman brake rotors, what is a good source online to buy them from? Also, how do I know which pads are best for my rotors? Another thing I've seen online is rotors that 'fit' my 960, but there are footnotes on the website such as, "For non ABS" or "for ATE type only". Well, I can figure out the first, but ATE I'm not familiar with.

Thanks for the help.

Call fcpgroton.com, Nick will probably answer the phone, (visit the web site to get the number) or IPD.com and just give them your car info. They are Experts in Volvo parts, they will ask the questions if there are doubts, and your assured of getting the correct parts.
ATE is a caliper manufacturer.
Also ask "what else" you may need to assure a complete job such as lube, pins, spring clips. Read the FAQs. make sure you open the bleeder valve when you push the pistons in to allow for the increased pad thickness. (FAQs says it may be detrimental to push brake fluid back through the ABS system.)
It may be time to bleed the brakes with synthetic DOT4 too.
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Tom F

Thanks for the help! I ordered from www.fcpgroton.com today. They were very helpful!

I got my Zimmermans from fcpgroton last week. $34 I think for vented ('93 940) Received them next day even though I went with standard shipping!