Bob - I just went through this (also a 30 TS). My front spring had three broken leaves when I disassembled it.
The Eaton Detroit Model A standard duty front spring is an 8-leaf equivalent to the original standard duty 10-leaf. If your car is a driver this is the way to go. If you want a new 10-leaf standard duty front spring there are not any current suppliers. You will have to hit the swap meets, or else re-arch your original.
https://files.secure.website/wscfus/10576359/26724600/model-a-springs.pdf gives a process for re-arching your originals. I followed this process last week on my front and it seems to have brought the spring right back to where it should be. Next is the rear, fortunately in much better shape.
Alternatively, you could send your spring leaves out for hot re-arching to any good spring shop (contact your local heavy truck repair shop for a referral). To do that you’ll need the original specs, which are on a print but I can’t read the print from what gets posted here.
When you reassemble don’t forget to paint the leaves with graphite paint. I got a quart from Snyder’s, I think - also available on Amazon.