I am impressed - those resistors are not +/-10% like normal resistors. They are more like +/- 0.1% or probably even better! I went through and measured ours - they were all exactly those values except for one. One of the 1270ohm measured more like 1270.5 with the display alternating between 1270 and 1271 - the rest were all exact. Rather than rolling our own, we are planning on using the board from the steering wheel donor just like Chad.
I don't think the resistor tolerances are all that critical. I think gold banded 5% resistors would be just fine. You're going to pay an arm and a leg for something that has a .1% tolerance. I don't even think that would be an option in your standard carbon film resistor.
Years ago I did an engine swap on my Camero with a VAT that used the little resistor in the key to enable the operation. I too thought that the tolerance was not that critical. There were charts for the possible values. I used 5% resistors and had to custom make a resistor that worked by putting a couple of resistors in series to get the required value to make it work.
Also keep in mind that a potentiometer would work too. While not optimal for permanent installation, they would make it easy to dial in the correct resistance assuming using one with a relative close value.