If your asbestos siding is largely in excellent condition and you decide to keep it, a common situation is that you’ll have a few pieces here and there (often the lowest shingles on the exterior walls) that have cracked or chipped, due to being kicked or bumped, etc.
If you’re looking to replace a few of the asbestos shingles on your home, various manufacturers today make a fiber cement replacement product that looks exactly like older asbestos shingles, but obviously contain no potentially harmful asbestos. These fiber cement replacement shingles can also be safely cut, drilled, and sawn to your heart’s content, if you need to cut a hole for an exhaust or vent pipe, etc.
GAF provides its Weatherside line of absestos replacement siding, which comes in various sizes and profiles, and James Hardie has its own line of popular fiber cement shingle siding as well. Another possibility is to check underneath your house, as sometimes extra original siding shingles were stored underneath homes as it was being installed, so sometimes original shingles can be found there. Care must be taken when installing them, obviously, and they should never be cut or sawn, but if you’re lucky the solution to your problem might be underneath your own home.