I'm sure they're in there, just buried deep somewhere. My wife's Chrysler Cirrus (or as I like to call it, "you can't be Cirrus" ) has them buried pretty well. I won't touch that thing. You have to pull off the whole intake manifold to change the plugs. Luckily it only has to be done every 100k miles.

http://www.overnightautoparts.com/infiniti-j30-g20--001-spark-plugs.html

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past MB rides:
'68 220D
'68 220D(another one)
'67 230
'84 SD
Current rides:
'06 Lexus RX330
'93 Ford F-250
'96 Corvette
'99 Polaris 700 RMK sled
2011 Polaris Assault
'86 Yamaha TT350(good 'ol thumper)