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Mustang Fastback Seat

J&P Cycles Part Number: 178-055

Manufacturer Part Number: 76420

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Description for Mustang Fastback Seat

• Look stylish and ride comfortably and cool on this streamlined, low seat

• Rider sits 1-1/2″ back legs for the ideal riding position

• The rear portion uses the same medium-density foam as the rider's seat, giving your passenger comfort as well

• Cut low for the rider and tapered in back

• Gel coated 3/16″ thick marine grade fiberglass baseplate

Product Specs

Product Specs for Mustang Fastback Seat

Front Seat Width:
Manufacturer Part Number:
High Quality Expanded Vinyl
Product Color:
Rear Seat Width:
Sold in Units:
Solo or Dual:
Surface Texture:
Warehouse Part Number:
Fitment Questions?

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Compatible Models

Harley-Davidson® Models

  • Street 500 XG500 : 2014–2019
  • Street 750 XG750 : 2014–2019
Customer Reviews

Customer Reviews for Mustang Fastback Seat

Overall Rating

5 out of 5 stars (based on 26 reviews)

5 stars (20)

4 stars (3)

3 stars (1)

2 stars (1)

1 star (1)

0 stars (0)


Way better than the factory seat. Fit the bike good. Lot better riding position, and the seat is a lot firmer than factory. The thing I like most about this seat is that it's rounded off and smoother toward the front; makes it a lot more comfortable in the thigh and crotch area.


Seat is beautiful and is a very nice upgrade from the stock seat. My issue and why I'm giving it only one star is because of how it mounts to the bike. The seat's female piece that slides over the Street's mounting bracket at the base of the gas tank is just simply too wide. When the seat is fully mounted and tightened down, there's still about an inch of wiggle room at the bracket. The seat moves from side to side at the base of the gas tank even with the weight of me sitting on it. It could shift mid-turn so I see this as a safety issue and would return it but the return policy on a mounted seat is preventing me from doing that. I'm going to have to do some fabrication to get the seat to mount tightly. In my opinion, this is a design flaw that Mustang should fix.


This is my 2nd Fastback seat, one was on my Nightster and now on my Softail. I really like the quality and durablity of the mustang seats. The comfort level is a big plus also :)

The Machine

Very comfortable, great seat.


5 Star


I really like this seat for cruising on my ‘80 FLH. It’s nice and comfy and has a nice lower back support.


love it


It is a really great seat !


The seat definitely looks good. It´s confortable too. Kind of stuck in "one" position. One thing that sucked that there´s a gap between the seat and the fender struts.


The seat is ok. The packaging is a JOKE. After returning the first 2 due to packaging failure in the exact same spot, which damaged the seat, the third one came with the packaging blown out in the same exact spot. Sheer luck it wasn't MORE damaged. After waiting 3 months, I'll take it and deal with the scuffs. Pathetic packaging and to be honest, bad customer service information when I inquired about it. "Oh yes sir the packaging will be corrected for the next shipment." Discouraging.

Instructions & Manuals
Important Product Notes

Seats, once mounted, cannot be returned. Returned seats must be in new condition with no evidence of wear or mount marks. Be careful to check fitment before mounting your new seat. When checking fitment of seat, place a cloth under seat, do not bolt down seat. Carefully set seat on bike and check fitment. Returned seats showing any signs of wear or mount marks cannot be accepted. Please be careful when checking fitment.

Shipping Note

Additional oversized shipping charges will be applied for expedited shipments within the contiguous U.S. Shipping charges outside the contiguous U.S. are calculated by weight and dimension during checkout.

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