Will this fit a 2016 outback limited?

I made that mistake. Read carefully. According to the info, it will fit the outbacks with 3.6 liter v6 engine. If you have the v4 2.5 you need the the 16mil inside diameter washer. These are 21 mil.

How should it be installed, flat site facing the oil pan?

No round to the oil pan surface flat to the drain plug

Will this work for a 2019 wrx?

No. It did not fit my 2017 WRX. The entire bolt almost fits through the middle. No where near correct size. Look for part 803916010.

What size are these really? subaru oem part # shown should be id=20mm, od=26mm, but some folks are getting a different size in the pkgs.

That's what the washers I bought measure. I see that I bought them in 2019.

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SUBARU GENUINE OEM 1985-2018 Subaru Oil Drain Plug Crush Washer Gasket SET OF 10 NEW 11126AA000

SUBARU GENUINE OEM 1985-2018 Subaru Oil Drain Plug Crush Washer Gasket SET OF 10 NEW 11126AA000

Product ID: 237720913

Details

Brand
Subaru
Manufacturer
GENUINE Subaru
Number of items
1
Shape
Round
UPC
752589529754

🔟Set of 10 washers included

🔧Genuine OEM Subaru part

🛠️Fits multiple Subaru models (1985-2018)

Description

🔩 Keep your Subaru running smooth with genuine precision – don’t settle for less!

BULK PACK CONVENIENCE - 10 washers per pack—ideal for regular maintenance or multiple vehicles.
MADE IN JAPAN QUALITY - Crafted with premium materials for long-lasting performance and peace of mind.
PRECISION ENGINEERING - 21mm crush washer designed for optimal oil drain plug sealing and durability.
WIDE MODEL COMPATIBILITY - Fits 1985-2018 Subaru models including WRX STI, Impreza, Legacy, Outback, and more.
FACTORY GRADE RELIABILITY - Authentic Subaru OEM ensures perfect fit and leak-free seal every time.

This set of 10 genuine Subaru OEM oil drain plug crush washers (part number 11126AA000) offers a perfect 21mm fit for a wide range of Subaru models from 1985 to 2018. Engineered for leak-proof sealing and durability, these factory-grade washers ensure reliable oil changes and maintenance with authentic Japanese craftsmanship.

Specifications

ASIN	B07CHY87T7
Brand	Subaru
Customer Reviews	4.3 4.3 out of 5 stars (319)
Item Shape	Round
Manufacturer	GENUINE Subaru
Manufacturer Part Number	suabru111216aa000
Model Number	suabru111216aa000
Number of Items	1
UPC	752589529754

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