Amazon needs to fix the fact that this filter does in fact, fit a 2018 harley davidson fat bob fxfb... cuz i use it all the time.

You can go the K&N webpage (link below) for this particular filter. There is a fitment guide there. According to that website this will fit a 2010 Fat Bob and several others.

does this filter a kn171b replace a 63798-99A

The 63798-99A would cross-reference to the K&N KN-171B Oil Filter.

Can I use this filter on my 2019 fatboy 107?

Not sure. A 2002 Lexus 300 SUV is the same filter as this I do know.

Will this work on a2016 wide glide 103 engine

This fit the 103 Harley Twin I have. Ultimately, put your make and model into your garage in Amazon and it will let you know if it applies. I suspect it will fit all 103 engines.

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🛵 Ride Clean, Ride Confident: The Ultimate Oil Filter Upgrade for Your Harley

BUILT TO LAST - Heavy-duty canister construction ensures durability on every ride
MAINTENANCE MADE EASY - Quick wrench-off design means less downtime, more road time
SEAMLESS COMPATIBILITY - Works flawlessly with synthetic, conventional, and blended oils—versatility you can trust
UNMATCHED OIL FLOW EFFICIENCY - Maximize engine power with superior oil circulation
ADVANCED FILTRATION TECHNOLOGY - Protect your Harley with synthetic-blend media that captures the toughest impurities

The K&N KN-171B oil filter is engineered for select Harley Davidson motorcycles, delivering high flow rates and advanced synthetic-blend filtration to protect your engine from contaminants. Built with a heavy-duty canister and tested for burst strength, it ensures durability and reliable performance. Compatible with synthetic, conventional, and blended oils, it features a fast wrench-off removal design and comes with a 1-year limited warranty.

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Manufacturer	K&N
Brand	K&N
Model	Harely Davidson Motorcycles
Product Dimensions	10.16 x 7.62 x 7.62 cm; 272.16 g
Item model number	KN-171B
Manufacturer part number	KN-171B
OEM Part Number	KN-171B
Safety rating	Não Aplicável
Item Weight	272 g

K&N Motorcycle Oil Filter: High Performance, Premium, Designed to be used with Synthetic or Conventional Oils: Fits Select Harely Davidson Motorcycles, KN-171B

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