I recently purchased some TEMPEST URHB32S Spark Plugs. In my order I received two Autolite XL by Unison Spark Plugs with the same PN.

It is to my understanding that TEMPEST bought out Unison but as to whether these two Autolite XL's are airworthy or not I do not know.

Anyone familiar with the usefulness of the Unison Spark Plugs? Would you send back and ask for the TEMPEST labeled plugs?

Much obliged