2017 highlander v6 manual says i need (denso 3491) 0.031 gap, but amazon & rock auto says this denso 4705, 0.040 gap fits?

I can't honestly answer your question. I bought for a 2006 Lexis IS350. I've had no issues.

Are these legit products?

Yes, very good original equipment plug in the Tacoma. Had mine in for over 45K now. No problems.

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⚡ Ignite your drive with precision and power!

TWIN TIP TECHNOLOGY - Double needle electrode accelerates flame kernel growth for peak engine performance.
EMI NOISE ELIMINATOR - Built-in monolithic resistor blocks electromagnetic interference for smooth electronic operation.
FUEL EFFICIENCY BOOSTER - Optimized electrode design improves fuel economy, saving you money on every mile.
PRECISION IGNITION POWER - Ultra-fine iridium tip reduces spark voltage for lightning-fast starts.
DURABILITY UNDER PRESSURE - All-around laser welding ensures unmatched reliability in extreme driving conditions.

The Denso Iridium TT 4705 spark plug features a 0.4 mm iridium center electrode and a 0.7 mm platinum needle-type ground electrode, engineered with twin tip technology to maximize flame kernel development. Its all-around laser welding and high melting point iridium alloy ensure exceptional durability and performance, while the embedded resistor eliminates electromagnetic noise, delivering superior ignition, improved fuel economy, and reliable operation under the toughest conditions.

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€ 43.16

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Irelandstore

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Smooth transaction and product arrived in perfect condition.

3 weeks ago

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The delivery time was excellent, and the packaging was secure.

2 months ago

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Manufacturer	Denso
Brand	Denso
Model	Spark Plug Iridium TT
Product Dimensions	9.3 x 2.5 x 2.5 cm; 45.36 g
Item model number	IKBH20TT
Exterior	Machined
Manufacturer Part Number	4705
OEM Part Number	DENS7
Position	Front, Rear
Item Weight	45.4 g

Denso Spark Plug Iridium TT - 4705

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