Broken Chain Guide Facings

[Shizap]

After taking off my cam covers, I discovered that the passenger side upper chain guide facing had a broken tab. It fell out as I was taking off the cam cover. Luckily I think it was still sitting in the correct place and there doesn't appear to be any damage to the plate holder. This isn't a big problem because it is simple to replace.



However, as I looked further I noticed on the drivers side that there appears to be another broken tab on a facing. This one is only accessible by removing the engine and taking off the front engine cover.



Am I correct that this is broken and does it need to be replaced immediately? And after the engine is removed and the front plate removed, how are these plastic facings installed? Do the chains have to be removed?

For reference the car has 105,000 miles.

Thanks,
Scott