I went over to check this vehicle in person.

Compression test:
#1. 150
#2. 150
#3. 150
#4. 170
#5. 180
#6. 185

Weak yellow intermittent spark, roughly every 15 - 30 crank shaft revolutions.


Note:
Look at this link for the broken resistor.

PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1992 Mercedes Benz 190E 2.6
Part: Aux. Fan Resistor
Note: Auxiliary Fan
.2 OHM : Black bracket
Chassis: F000000-F637529
G5040-51923 Aux. Fan Resistor Beru IN STOCK

i agree with your findings, but not all have a mercedes dealer close by or prefer to buy parts from them due to cost, i posted my findings so people would not panic if their replacement plugs were resistor type.

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1967 250 S
1967 280SE
1968 250S
1971 280 SE
1973 220
1974 280 S
1975 450 SEL
1976 220 D
1979 300SD
1983 300 SD
1985 230 TE euro
1986 280SL
1986 500 SEL euro
1986 190E 2.3
1990 300 SE
2003 C230 K
2004 C230 K
1987 560SEL
1987 300SDL now in canada
2005 C230
1998 C43 AMG Sold to DON
1993 190E 2.6
300TD Former daily driver Totaled
current:
R320 CDI
Ram 2500 Cummins