Just to add to this:
If you want custom length cable, FS.com has them, OS2 fiber cable.

The fiber termination 'cut'/polish/connector is usually either UPC or APC, can tell by colour of the connectors, green = APC, blue = UPC. Usually can see on both cable plug and ONT port as well.

APC is better(Marginally less signal loss), but unfortunately you can't mix and match UPC and APC, the fibers WILL be damaged, or at least scratched.

As for the connector itself, if you'd like to run a long distance cable and the SC connector is too big to run, you can go for the LC connector, it's smaller in size. So like this > TM Cable, then SC > SC adapter at the start if no FWS, then SC > LC cabling, then on the other end place an LC > LC adapter and finally another LC > SC cable to the ONT. (If you have a FWS then just plug in SC-LC cable into that)

You could run two(duplex) fibers if you wish as well

Single/Simplex Fiber: https://www.fs.com/sg/products/12285.html
Two/Duplex Fiber: https://www.fs.com/sg/products/50147.html
SC Adapter: https://www.fs.com/sg/products/48488.html
LC Adapter: https://www.fs.com/sg/products/17579.html (Must be duplex to fit with the wall box below)
Wall box thing: https://www.fs.com/sg/products/14457.html

Technically you could run the bare fiber cables without a plug on one end (pigtails), then use a mechanical splicer and reattach the connector (by joining another pigtail), if you really can't spare a slightly bigger hole. But- that needs extra tools