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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SHIMANO Hollowtech II Left Crank Arm Safety Plate

Product ID: 3400865

⚖️Ultra-lightweight 4.54g design

⚙️Precision-engineered crank arm fit

🛡️Durable safety plate protection

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Description

🛠️ Elevate your ride with precision and protection – because every gram and gear counts!

FEATHERLIGHT BUILD - At just 4.54 grams, it adds minimal weight while maximizing durability
COMPACT SLEEK PROFILE - Minimal 0.75 x 0.25 x 0.25 inch dimensions for a clean, aerodynamic look
TRUSTED SHIMANO QUALITY - Backed by a limited warranty and engineered by a leader in cycling innovation
ROBUST SAFETY PLATE DESIGN - Protects your crank arm from damage and wear during intense rides
SEAMLESS HOLLOWTECH II INTEGRATION - Optimized for Shimano’s advanced crank system for peak performance

The SHIMANO Hollowtech II Left Crank Arm Safety Plate is a precision-engineered, ultra-lightweight component designed to protect your crank arm while seamlessly integrating with Shimano’s Hollowtech II drivetrain system. Crafted for durability and minimal weight, this sleek black safety plate ensures enhanced performance and longevity for serious cyclists.

Specifications

Item Package Dimensions L x W x H	1 x 1 x 1 inches
Package Weight	0.09 Kilograms
Item Dimensions LxWxH	0.75 x 0.25 x 0.25 inches
Item Weight	4.54 g
Brand Name	SHIMANO
Warranty Description	Limited Warranty
Model Name	Y1GE98050
Color	black
Suggested Users	unisex-adult
Number of Items	1
Manufacturer	Shimano
Part Number	Y1GE98050
Included Components	Crank Arm Fixing Bolt

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