A couple of things:
First, "where can I get..." questions are nearly impossible to answer unless you tell us roughly where in the world you are--a country is close enough. These are international forums and it does you little good if we recommend a source that will not ship to your country or region.
Second, the Hosts redacted your serial number for security reasons so we cannot determine your computer's sub-model--the bit with a year displayed. Instead, please do "About this Mac" from your Apple menu and tell us the sub-model that shows:

That helps in that, in the 13 years MacBook Pros have been made, Apple has changed the way trackpads are attached. In some newer Retina models they cannot be replaced without replacing the entire upper case including keyboard and possibly the battery. Could be very costly...parts alone listed on one repair site are US$700 if you supply do the labor at home.