The stock guides are a comodity part, cast iron, and they offer over sizes FWIW. The stock guides have a loose stem fit to prevent the exhaust valve seizing (not the root cause) as they did on the hotter running 07-08 bikes. The program replacement heads for these early 110 touring bikes have these guides fitted and I have one on my desk that seized anyway, the photo, and ripped the guide right out of the head in half. This head was fixed, no issue. They increased the press fit (which wasn't the root cause) and they also have an annoying snap ring groove that pulls metal when the heads are heated and guides driven out, actually that metal pull happened when they initially are pressed in, just get worse going back out. Have that issue dealt with now too. We porters have to work with what we are dealt for cards and on 110 heads, all of them for us, first order of business is to take out the stock guides and fit with the right press and stem clearance the AV&V bronze maganese guides. These can run a little closer fit for more valve and seal life and lower oil consumption.