Does this safety plate fit a Shimano SLX FC-M660 that has the Shimano part # Y-1FU 98120 ?

Unsure specifics on your product number...it does fit shimano, Durace 7800 left crank arm; it's simply a spacer, as long as you frequently check the left crank arm bolt torque which holds it on (torque is 12-15 newton meters). I check it x1/month. Hope this helps

More to the point: is this the spacer for road cranks (FC-7800) or the one for mountain cranks? I'm guessing road but it doesn't say.

The FC-7800 is a road crankset, but the safety plate will work for any hollowtech II crank. Note, this is not a spacer, but rather a retention safety device in case the left crank's pinch bolts loosened up. This plate will prevent the crankarm from falling off.

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⚙️ Elevate your ride with precision and style — don’t let safety take a backseat!

PREMIUM BLACK FINISH - Matte black coating that complements any high-end bike aesthetic.
COMPACT STREAMLINED - Only 1 inch in height and width, maintaining your bike’s sleek profile.
FEATHERLIGHT DURABILITY - At just 23 grams, it adds minimal weight while maximizing protection.
ESSENTIAL SAFETY UPGRADE - Protects your crank arm fixing bolts from damage and wear, ensuring longevity.
SEAMLESS SHIMANO INTEGRATION - Designed specifically for Hollowtech II crank arms for flawless compatibility.

The Shimano Hollowtech II Left Crank Arm Safety Plate is a lightweight, compact, and durable component designed to protect your crank arm fixing bolts. With a sleek black finish and precise fit, it seamlessly integrates into your bike’s drivetrain, enhancing both performance and longevity.

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Color	Black
Height	1 inches
Item display length	1 inches
Weight	23 g
Item display width	1 inches
Number of items	1
Batteries included?	No
Brand	SHIMANO
Manufacturer	Shimano
Item model number	Crank Arm Fixing Bolts
Product Dimensions	1.91 x 0.64 x 0.64 cm; 4.54 g
ASIN	B003RLNCS6

Hollowtech II Left Crank Arm Safety Plate

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