I had 1 out of 2 of these for a Trek Soho I was building up. I'm not even sure you can buy these through Trek, QBP, etc. If you could, they would cost more than they're worth. Just print your own.

For bikes with internally routed brake cables. Use like this: (https://www.google.com/search?q=brake+cable+internal+cover&rlz=1C1CHBD_enUS706US706&tbm=isch&imgil=gv6V44UDyzdYKM%253A%253B-sMU7JHtu8TFBM%253Bhttp%25253A%25252F%25252Fwww.mbr.co.uk%25252Fhow-to-2%25252Fsilence-bike-four-easy-steps-322631&source=iu&pf=m&fir=gv6V44UDyzdYKM%253A%252C-sMU7JHtu8TFBM%252C_&usg=__GHIOI4wRmJuxTEdjSu3VERSGPdQ%3D&biw=1270&bih=1330&ved=0ahUKEwirl5DOqe_QAhVN-2MKHWQ7BNAQyjcInQE&ei=2PFOWKvLF832jwPk9pCADQ#imgrc=us_0qkIyPScwcM%3A)

Look like this: https://www.google.com/search?q=brake+cable+internal+cover&rlz=1C1CHBD_enUS706US706&tbm=isch&imgil=fQsAKKEcqyR2GM%253A%253BVFBQZeL349IEEM%253Bhttp%25253A%25252F%25252Fwww.chainreactioncycles.com%25252Fvitus-bikes-zenium-internal-brake-cable-guide-2015%25252Frp-prod129590&source=iu&pf=m&fir=fQsAKKEcqyR2GM%253A%252CVFBQZeL349IEEM%252C_&usg=__18Flf00mRy-8UMy7W9d7fyRJkvQ%3D&biw=1270&bih=1330#imgrc=fQsAKKEcqyR2GM%3A

I guess people do sell them: https://www.aliexpress.com/store/product/10pcs-MTB-moutain-bike-frame-inner-line-clip-road-track-frame-brake-derailleur-internal-cable-guide/1930138_32627456158.html Best of luck if it fits your frame though.

This is not a cable stop. The housing just goes clear through. Designed from a Trek Soho brake cover that I did have. I lost the other one. It fit very well (no rattle, fairly tight) on the first try. It may only work on Trek bikes, I'm not sure. I saw a Felt Verza Speed with a cover that looked very similar. Not sure if it's universal or not.

Will need a decent amount of post processing to clean off the supports. Use a drill to clean the hole.

Obligatory safety warning since this has to do with your braking. Don't think it'll affect it at all, but use at your own risk. It literally just keeps the cable housing from rattling, but nonetheless.