PEH:

I replace my GPs in sets because I've found that if one is bad, the others look nasty, too, and it's not enough fun to replace them one at a time.

Besides, if you drive a Volvo, you learn to replace bulbs in sets, too, or that d....d lamp out warning light keeps coming on!

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!