1. What are my vendor options to purchase VOLK TE37(SL)?
From what I have seen ScienceOfSpeed and A.S. Motorsport should be able to get you wheels. Not sure if thensxshop.com is a vendor so maybe I will be in the wrong for mentioning it but I know they list the Volk TE37SL on their site as well.
2. What are my size options? The common consensus from research thus far seems to be Front Spec: 17×8.5 +40mm 5×114.3 | Rear Spec: 18×10.5 +45mm 5×114.3
From my research when I was looking for wheels is the TE37 (OG) comes in these specs
Front Spec: 17×8.5 +40mm 5×114.3
| Rear Spec: 18×10.5 +45mm 5×114.3. The TE37 (SL) appears to only come in these specs
Front Spec: 17×8.5 +40mm 5×114.3
| Rear Spec: 18×10 +30mm 5×114.3. So only the rears are different on these two setups with the SL being about 8mm more aggressive wheel. Both should be just fine though and not poke out.
3. Tire/size options?
Going based on the TE37 (SL) you asked about ideal tire sizes are Front 215/40/17 and Rear 265/35/18 since you say you have a 93. Many on the forum seem to say to stay away from 275 rear if you care about handling. With the TE37 (SL) that isn't as much as of a concern. I have the TE37 (OG) and I am still trying to figure out whether I want to go with 265 or 275 years. I really don't want the stretch the 265 will give me on a 10.5. Wish I had the 10in rear honestly.
4. I see some folks who have replaced fenders. I dont want to do that and retain the factory setup.
With the TE37 (SL) or (OG) in the specs listed you would not need to replace fenders at all.
Here is a picture of my setup with the TE37 (OG) in the above specs listed with 215/40/17 and 285/35/18 tires. I do not rub at all. Don't plan on keeping these tires on the wheels but that is what was on them when I purchased them.
My wheels do sit a little further out than yours will if your car is stock as the hats on the stoptech brake kit rotors are thicker than the factor rotors so I think 4mm further out in the front and like 2.5mm more in the rear.