I have 4 new in box Bosch glow plugs. Bought for my 300SD (now sold) and only needed 1 plug not 5! Compare at $8.86 each when I bought them. I'll throw in a new strip fuse for the glow circuit. These are pencil type. $25.00 for 4 plugs, fuse, and shipping included in the 48 states.

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1985 300TD
1984 380SL
1983 280SE (full Euro, trunk triangle and all!)

Formerly owned:
1986 420SEL
1984 300D
1983 300D
1981 300SD
1976 300D