O.S. Engine - Glow Plug #RP6 (Turbo) Medium   [OSMG2703]

QUALITIES:

• T-series glow plugs are ideal for racing automobile engines that creates high RPM
• For .12, .15 and .21 size turbo mind on-road race engines
• Ideal plug for cool outside conditions

REMARKS:

This radiance plug varies through the old-fashioned glow plug. It's made to fit the inner head of engines with a turbo-type cylinder head design

How to pick the proper Glow Plug? Please make reference to these website link.
http://www.osengines.com/accys/choosing-glowplugs.html