It is highly recommended to use glow plugs made by the original OEM supplier, Bosch.

Some brands of glow plugs have been known to fail prematurely; others have been known to fall apart inside the pre-chamber leading to much more work to remove them.

When using Bosch, it's good to keep in mind that fraudulent reproductions exist on the market. Look for the proper authenticity marking. Be careful where you buy them, and look to see what country they are made in.

If you want to be sure, Bosch offers a way to check the code on the package against their code database.

There are other brands that can be used instead, but be sure to do your research.