My 87 GN just started this. Each time I press the brake pedal the light on the dash comes on for a second. From what I've read and done a few checks everyone seems to think it's the accumulator ball. I see Kirbans has new ones that are a little different in size from original. Are there other vendors that sell original ones? Also do you think buying the one from Kirbans would in any way affect the value of the car negatively since it's not quite the same? The car has 16,000 miles on it.