To fit standard old school drilled trucks like Tracker Midtracks on a Stereo Vinyl Cruiser, Fish Skateboard or a Penny, there is a little drilling that needs to be done. Some people say they have been able to just force the bolts through, but I have not experienced this, I have drilled all mine.
A comment on another post asked for some pics of the holes drilled. Here they are.
The Left is the stock hole. Right is the drilled hole. As you can see, we are not drilling a whole new hole, just opening up one side of the existing hole because the standard mounting hole pattern is just a little bit longer than the Penny / Vinyl / Fish mounting pattern.
This opens up our choice of trucks to anything really narrow and drilled for old school mounting.