Help!

I'm putting a D&B 3.7 twin in a 30% carden Extra. I need to jack the cowling around about 1/8" to get the front of the cowl to perfectly line up with the backplate of the spinner.

Here's the problem... the spark plugs stick out sideways, and are basically touching both sides of the cowl at the same time.

I need spark plug(s) that have a shorter over-all-height, as measured sticking out of the cylinder.

Can anyone tell me what spark plugs to buy, and where to get them??