I had these on my Rotax 503 engine and I recently did a rebuild on it. I broke one trying to get it out of the exhaust manifold. I really liked these as they go under the head bolts and eliminated the problem with compromising the end that goes against the head every time I changed my spark plugs. I had two sets that went under the plugs before I got ones like these that went under a head bolt. They lasted a long time. I definitely recommend these. Purchase and shipment from Aircraft Spruce was prompt and problem free.
June 22, 2018
Q: Is this probe compatible with the AVMAP ENGIBOX?
Neither manufacturer was able to confirm compatibility. We were offered these specs for the probe: This probe is a type k probe that is 48in long and rounded.