I just wanted to let people know that it is possible to get the inner bolts off with basic tools seeing as I just did it this afternoon. Some tips:
1. Soak everything in PB Blaster- Not only does this lubricate and remove rust but it also heats up as you start twisting which makes removing the bolts much easier
2. Work bottom up as removing the bottom bolt makes room for the top.
3. Facing the back of the car and working on the left bumperette, have your 11/16 wrench flat on the nut on the back and angled down to the right. Squeeze your fingers in there to hold the wrench flush to the nut then turn the bolt (5/8) and let the gas tank offer the resistance to turning.
4. Repeat for top bolt
5.Working on the right bumperette put your 11/16 wrench flat on the nut and again angle it to the right. Squeeze your fingers in there to hold it flush and this time let your leaf spring/shackle offer the resistance to turning.
6. Repeat for top bolt
7. Take off the outer bolts. This is easy compared to the inner.
This really is a big pain to take off but once you get the jiff it isnt too bad. Also, it might suit you to use a ratchet to hold the nut in place. If you only have shallow or short attachments you will have to loosen it with a wrench until you can get the ratchet around.