Length 36mm from tip to tip. I have some old Necchi - BU Mira and some Supernova. Some of my cars had 38mm bulbs, but some seemed to be looking for something like 37mm. To replace the longer bulbs, I put a 6-32 Philips pan head screw in the hole. Vessel head inwards. This compensated for the new lamp's tip length mismatch in the cruciform layout of the Philips head. It was too much for other machines on which I just used a small shim to make up for the lesser difference.
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