and what size will plug them?

 

That is where my seat attaches. Mine is threaded. I don't know the size. Sorry, not much help here.

 

Those are for the Original seayt mount, well they were on my Fat Boy I put on a mid frame chrome cover. I think you can also mount a second pair of footpegs which gives passenger another riding position.

 

... sorry could not delete

 

My buddy had pegs there for his kids to put their feet on when they rode with him, thats all i know about them.

Brent

 

Seat mounts for the stock seat on a Fat Boy. My Mustang set doesn't use them but I think they are hidden under the seat now. Seems awful high to put an extra set of pegs on.

 

Not sure what they are for but a quick fix would be to the hardware store for a rubber style plug, or maybe even some black silicone. Not exactly the custom bike fix but it would fill the hole and make it much less noticible until you found a better solution.
MikeM

 

The hole is for a solo seat bolt I had little black plugs in mine from the factory.

 

 

Just so you know below your primary and back 4in theres a nother one I think its the same size you could match up??????????