Hi,
These are attached with ordinary resin so it's pretty easy to get them of and do repairs (in case of hull damage) they can be sealed easily enough with clear silicone however if they're actually cracked you'll need to repair (reinforce with glass) or replace them with a new set from performance.

"House prices have risen by nearly 25 percent over the past two years. Although speculative activity has increased in some areas, at a national level these price increases largely reflect strong economic fundamentals." – Ben Bernanke – 2005