• MOOG-K90421 discontinued by Moog. Replaced by RK90421
  • MOOG-K90421 discontinued by Moog. Replaced by RK90421

discontinued by Moog. Replaced by RK90421

Manufacturer: MOOG
Part Number: MOOG-K90421


Price: $98.55
Availability: Out Of Stock
Out of Stock

  • Moog Premium Steering Components carry a Limited Lifetime Warranty. Moog R-Series Control Arms, Hub Assemblies, and Strut Assemblies carry a 3 Year Warranty. Moog warranties their parts to be free of defects in materials and / or workmanship during these timeframes as measured from the date of purchase. If a Moog part should fail due to a materials or manufacturing defect while under warranty, we will provide a replacement of the part upon return of the defective part.
  • Cross Reference from MOOG-K90421 to MOOG-RK90421MOOG MOOG-RK90421
    Rubber. K90421 has been discontinued by the manufacturer. RK90421 replaces it.
    Price: $73.09
    Warranty: 3 Year to Limited Lifetime

Fitmentdiscontinued by Moog. Replaced by RK90421 MOOG-K90421 fits these vehicles:
  • For Driver Side (Left Side)

Moog Stamped Arms

Moog Control Arms: CK, K, or RK?

CK, K or RK? We here at Diverse Suspension Technologies get this question a whole lot. If you are putting parts on your vehicle, you want to know exactly what you are installing. It can be hard to do that with all of these letter designations. So here is all that you need to know to clear up the confusion.
Moog Stamped Arms

CK (K): Moog Problem Solver

Starting with the CK and K. Whether you see a "K" designation or a "CK" designation, you are getting the same part. The CK and K are Moogs Premium line of control arms. Utilizing their "problem solver" technology, these control arms address common factory design issues providing a better than original replacement for your vehicle. Most CK and K control arms include ball joints that are powder coated metal with gusher bearings giving them a long life. These ball joints are serviceable and have grease fittings. The CK and K arms also have problem solver bushings and a precise fit and form for easy installation.
Moog Forged Arms

RK: Moog R Series

The RK series is a more value driven part. Because there are so many different vehicles both foreign and domestic, Moog has introduced the R-Series arms to provide replacements for a wide range of vehicles. The RK arms have OE fit and form geometry alignment, with pre-installed OE style bushings and most include the ball joints. However these ball joints are not serviceable like the CK arms. All of the R Series arms have Moog validated construction and design, providing a less expensive alternative.
Moog Stamped Arms

Type and Warranty

Each line of control arms has Forged Steel, Stamped Steel, or Forged Aluminium arms to provide the best style for your specific vehicle. The Premium CK line has a limited lifetime warranty, and the RK has a 3 year warranty that are both handled through our awesome customer service team at DST. Whether you are looking for a "light on the wallet" OE replacement, or a "premium" control arm upgrade, Moog control arms are a great choice for your vehicle.

Fitment for moog-k90421
MakeModelYear RangePositionDrive WheelQuantity RequiredEngine BaseEngine VINEngine Designation
Mercedes-Benz300SD1993-1992Front Left Upper Quantity 1
Mercedes-Benz300SE1993-1992Front Left Upper Quantity 1
Mercedes-Benz400SE1992Front Left Upper Quantity 1
Mercedes-Benz400SEL1993Front Left Upper Quantity 1
Mercedes-Benz500SEC1993Front Left Upper Quantity 1
Mercedes-Benz500SEL1993-1992Front Left Upper Quantity 1
Mercedes-Benz600SEC1993Front Left Upper Quantity 1
Mercedes-Benz600SEL1993-1992Front Left Upper Quantity 1
Mercedes-BenzCL5001999-1998Front Left Upper Quantity 1
Mercedes-BenzCL6001999-1998Front Left Upper Quantity 1
Mercedes-BenzS3201999-1994Front Left Upper Quantity 1
Mercedes-BenzS3501995-1994Front Left Upper Quantity 1
Mercedes-BenzS4201999-1994Front Left Upper Quantity 1
Mercedes-BenzS5001999-1994Front Left Upper Quantity 1
Mercedes-BenzS6001999-1994Front Left Upper Quantity 1