I just did the valve guide seals on my 102. The replacements came as different colors (brown and black) with no indication as to which was which. I was a little thrown at first when I removed the valve cover and saw that the originals on the head were all brown.

As hs_300e indicated, they are noticably different sizes -- it will be evident when you have one of each off which goes where.

Good luck.

__________________
Jeff Pierce

Current Vehicles:
'92 Mercedes 190E/2.3 (247K miles/my daily driver)
'93 Volvo 940 Turbo Wagon (263K miles/a family truckster with spunk)
'99 Kawasaki Concours
Gravely 8120
Previous Vehicles:
'85 Jeep CJ-7 w/ Fisher plow (226K miles)'93 Volvo 940 Turbo Wagon
'53 Willys-Overland Pickup
'85 Honda 750F Interceptor
'93 Nissan Quest
'89 Toyota Camry Wagon
'89 Dodge Raider
'81 Honda CB 750F Super Sport
'88 Toyota Celica
'95 Toyota Tacoma
'74 Honda CB 550F