TOP is where TOP is written

Headlight inserts are marked, be it with TOP or OBEN or simply by the course of the inscriptions on the glass. In any case, ready-made headlight inserts with reflector, bulb holder, diffusing lens etc. are only available for round lamp housings. For all other shapes there are only individual lenses and reflectors, all parts sell separately.

So here it's all about the round headlight inserts, in 3-1/2" to 7" glass diameter, for fitting with incandescent bulbs from the ole P15d to H4 and H7 or even full LED versions of SpeedFire.

You guys write 5-3/4" in the shop. I need a headlight insert with 153 mm! So what will fit for me?

Quite likely a 5-3/4. The stupid, nasty (call it what you want) thing is that with 4-1/2", 5-3/4", 7" always only a so-called nominal diameter is given for the glass part from which the light exits. Edge areas, bonding, etc. are not taken into account. The exact diameter of the headlight insert is given with the respective article.