I recently purchased a set of Karlyn-STI #112 spark plug wires (Part #: 003-159-12-03-M14) and Bosch WR-7-DC+ spark plugs from Pelican Parts and the spark plug and wires don't fit together. The hole that the spark plug would "clip" into inside the spark plug wire boot is too small. What are my other options given that Pelican Parts doesn't have any other plugs or wires for my 1966 Mercedes 250s. I called Pelican and they gladly offered a refund but that still leaves me up s**** creek without a paddle.

Does anyone have another suggestion? I'm guessing these spark plug wires might be for the 1968-1972 250s?