As Randall said, yes... 25D is the shape/type and 4 is for 4-cylinder. For a TR4 with negative ground you want LU142A. If your car has positive ground it will need LU142AP12. Shop around for the best price available. When I last bought one the best price came from Retrorockets (online). You can find them by Googling for "retrorockets pertronix".