52 Pa. Code § 1017.43
The Authority will publish a list of approved makes and models of vehicles permitted for use as taxicabs, which will be available at www.philapark.org/tld. The list of approved makes and models of vehicles is not exclusive and may be amended upon written request to the Manager of Enforcement.
This section cited in 52 Pa. Code § 1017.42 (relating to prerequisites to inspection).