Will this fit into my existing mirror housing, or do I need to replace the whole mirror?

This is a lens-only replacement. Your factory mirror bracket and housing stay in place—you're swapping just the glass. Test-fit before you commit to installation to confirm alignment with your housing tabs.

Does this come with fasteners or clips to hold it in the mirror frame?

Hardware is not included. Your original mirror housing will have its own retention system. Confirm your existing clips or fasteners are in good condition before installing the new lens.

Can I install this myself, or do I need a shop?

Most mirror lens swaps are straightforward if you're comfortable working with small clips and panels. You'll need basic hand tools and patience. If your housing tabs are damaged or bent, a shop can correct those before the new lens goes in.