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 engineered for durability and to endure extended service intervals.
TESTED TRUSTED - Laboratory-verified burst strength and capacity backed by a 1-year limited warranty.
EFFORTLESS MAINTENANCE - 17mm welded hex nut lets you remove the filter fast—no more wrestling with tools.
UNIVERSAL OIL COMPATIBILITY - Optimized for synthetic, conventional, and blended oils to fit your riding style.
UNMATCHED ENGINE PROTECTION - Advanced synthetic-blend filtration keeps your Harley’s heart running clean and strong.

The K&N KN-171B Motorcycle Oil Filter delivers high flow rates and superior filtration using a synthetic-blend media compatible with all oil types. Designed specifically for select Harley Davidson models, it features a heavy-duty canister and a convenient wrench-off nut for quick removal. Tested for durability and capacity, it supports longer service intervals and comes with a 1-year limited warranty, ensuring premium engine protection and hassle-free maintenance.

AR$61609

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Brand	K&N
Product Grade	Performance Part
Vehicle Service Type	Motorcycle
Item dimensions L x W x H	4 x 3 x 3 inches
Outside Diameter	2.91 Inches
Thread Size	M17 x 1.5
Item Weight	0.6 Pounds
OEM Part Number	KN-171B
Global Trade Identification Number	00024844087737
Manufacturer	K&N Engineering
Number of Items	1
Automotive Fit Type	Vehicle Specific Fit
UPC	759173941725 182683047043 024844087737
Model	Oil Filter
Item Weight	9.6 ounces
Product Dimensions	4 x 3 x 3 inches
Item model number	KN-171B
Is Discontinued By Manufacturer	Yes
Exterior	Other
Manufacturer Part Number	KN-171B
Safety Rating	Não Aplicável

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

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