Yes, 2 choices:
1.) Stock Replacement
Description: Body Bolt
Exact Description: M6-1.0 x 25 Phosphate 24mm Washer O.D. Hex Head SEMS Body Bolt
Manufacturer: Auveco
Auveco Part # 12066
I purchased mine from Fastenal but they can be found elsewhere.
Fastenal Part # 0162791
or click here
http://www.fastenal.com/web/products...6searchMode%3D
These are ok and I did use them for most of the restore, HOWEVER the rear bolts, the exact ones you describe, I personally used stainless steel on those. I liked the way it looked AND it will never rust (which is likely due to their rear location).
2.) Stainless Steel Replacement
In this case you need:
Stainless Body Bolts
M6-1.0 x 25mm DIN 933 Class A2 Stainless Steel Cap Screw
Fastenal Part# M82550025A20000
or click here
http://www.fastenal.com/web/products...6searchMode%3D
Stainless Fender Washers
Fastenal Part# 1171212
1/4" x 1.000" 18-8 Stainless Steel Fender Washer
or click here
http://www.fastenal.com/web/products...6searchMode%3D
You will also need 2-3 smaller washers for far left and far right bolts
Fastenal Part# MW6380000A20000
M8 DIN 125 Stainless Steel A2 Flat Washer
or click here
http://www.fastenal.com/web/products...6searchMode%3D
NOTE
You probably already know this, but in case someone else that's reading does not... I highly recommend using something like Anti Seize. I use it EVERY TIME that I screwed a bolt/screw into the frame of the VX. This is to protect and to ensure that rust won't develop in the threads or on the bolt/screw.
I also purchased it at Fastenal but can be bought elsewhere.
Anti-Seize made by LocTite
Fastenal Part# 62701
or click here
http://www.fastenal.com/web/products...6searchMode%3D