Is this for two? or just one?

There are 2 of them: One for the front and the other for the rear derailleur. They work great. You also could skip them and use a long cable.

Are these concave or flat? And does it actually have one barrel adjuster and one wing adjuster? Photo shows two barrels.

Concave with a square socket that fits over a square brazeone mount. Right and left stops both with gray plastic barrel adjusters.

Does this come with all the hardware you need? i.e. the screws to install on a bike?

It came with hardware, but I did not use it. I installed the cable stoops on the existing shift lever studs. I used a locknut instead of the original nuts because I would not need to adjust the like shifter levers do.

can this one patch the hole of my downtube from where the original shifter come from?

There should be a brazed-on post that the old shifter was attached to. It is a square piece with a threaded hole. This will fit over it allowing you to run the cable from your brake lever/shifters through this housing, and then to the derailleurs. You will need cable housing from the shifters to this device. This works perfectly for upgrading from downtube mounted shifters to handlebar mounted shifters.

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SHIMANO Spares SM-CS50 outer down tube cable stops assembly for steel frames, silver a, One Size, Y67B91000

Product ID: 49413287

Details

Brand
SHIMANO
Item diameter
28.58
Material
Plastic
Valve type
Schrader
Wheel size
26 Inches

🔧Lightweight 18g durable build

⚙️Precision fit for steel frames

🚴‍♂️Optimized for 28-32mm tire width

Description

⚙️ Upgrade your ride with precision-engineered cable stops—because every detail counts!

LIGHTWEIGHT YET DURABLE - At just 18 grams, this component balances minimal weight with robust plastic construction for long-lasting performance.
TAILORED FOR STEEL FRAMES - Specifically engineered outer down tube cable stops for a perfect fit on steel frames, enhancing cable routing efficiency.
OPTIMIZED TIRE WIDTH RANGE - Supports tire widths from 28 to 32 millimeters, ideal for versatile road cycling setups.
TRUSTED QUALITY WARRANTY - Backed by Shimano’s 1-year manufacturer warranty and a 4.7-star rating from nearly 700 riders—join the elite cycling community.
SEAMLESS SHIMANO COMPATIBILITY - Genuine OEM part ensures flawless integration with your road bike's shifting system.

The SHIMANO SM-CS50 outer down tube cable stops assembly is a genuine, lightweight replacement part designed for steel frame road bikes. Compatible with tire widths between 28-32mm, it ensures smooth cable routing and reliable shifting performance. With a durable plastic build, a 1-year warranty, and high customer satisfaction, it’s the go-to upgrade for discerning cyclists seeking flawless OEM quality.

Specifications

ASIN	B001JH9KUY
Best Sellers Rank	132,839 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 233 in Cables (Sports & Outdoors)
Bike Type	Road Bike
Brand Name	SHIMANO
Compatible Tire Width Maximum	32 Millimetres
Compatible Tire Width Minimum	28 Millimetres
Customer Reviews	4.7 4.7 out of 5 stars (700)
Global Trade Identification Number	00689228127333, 04524667127338
Included Components	Spares & Brake & Shift Levers
Item Diameter	28.58 Millimetres
Item Type Name	Parts
Item Weight	0.04 Pounds
Item Width	1.13 Inches
Manufacturer	Shimano Spares
Manufacturer Part Number	FBA_Z67B91000
Manufacturer Warranty Description	1 year manufacturer
Material Type	Plastic
Model Number	Y67B91000
Number of Items	1
Size	29 x 28-32 mm
UPC	689228127333
Unit Count	1.0 count
Valve Length	2.17 Inches
Valve Type	Schrader
Wheel Size	26 Inches

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