To answer the question the OP asked: yes, get the one with the extra lead. It will brighten all the lamps.
Now to completely hijack this thread and address Marty's question. This is an interesting topic that I have been debating with the guy that does my inspections. His simple explanation is that in Virginia it is illegal to burn fog lamps with high beams. I'm not so sure that this is true.
In looking at the Virginia Code, 19VAC30-70-160. Auxiliary lamps: backup; cornering; driving; fog; spot and warning (
http://lis.virginia.gov/cgi-bin/legp604.exe?000+reg+19VAC30-70-160), there appears to be more to it than the simple explanation above.
First off, you have to pay attention to the type of light being fitted.
A. Auxiliary lamps on a vehicle consist of seven general types: backup lamps (SAE-R), cornering lamps (SAE-K), driving lamps (SAE-Y), front fog lamps with an amber or clear lens (SAE-F and rear fog lamps with red lens (SAE-F2), spot lamps (SAE-O), warning lamps (SAE-W, W2, W3), and daytime running lamps (DRLs) (SAE-Y2).
Of interest here are Driving (SAE-Y) and front fog (SAE-F) lights.
Section D makes a relevant blanket statement:
D. No more than four lamps, including two headlamps, may be lighted at any time to provide general illumination ahead of the vehicle.
Section I, paragraph 10 talks about driving lights:
10. Driving lamps are not required. However, if installed they must operate and be inspected.
Inspect for and reject if:
... <removed sections not relevant> ...
h. Driving lamps are not wired so that they will burn only when the high beams of the regular headlamps are activated;
So this reads as driving lights must be wired so that they burn only when high beams are activated. Correct?
Now Section I, paragraph 11 talks about fog lights:
11. Fog lamps are not required. However, if installed they must operate and be inspected.
Inspect for and reject if:
a. A vehicle may be equipped with more than two fog lamps; however, not more than two fog lamps can be illuminated at any time;
b. Lamps are not of an approved type (DOT or SAE-F on front or F2 on rear plus two-digit year and manufacturer) or a lamp has been altered;
...
f. Any fog lamp is mounted above the level of the regular headlamps, or is not mounted firmly;
g. Lamps are not wired and aimed according to the following instructions:
(1) Fog lamps are general illumination lamps as covered in subsection A of this section. They must burn through the tail light circuit even if on a separate switch. If installed on a vehicle with a four-headlamp system, or a vehicle equipped with driving lamps, they must be wired into the low beam circuit.
...
So if I'm reading this right, there is no restriction to burning fog lights full time on the Rocket as it only has one or two headlights.