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so, for those interested, i finally found the official trap speeds from the 1999 race and they are surprisingly high.
they are all measured before the breaking point for the second chicane (post p10 carte s), which means they are anywhere from 5 km/h to 10 km/h lower than the ones the cars did before the first chicane, and they're also only measured for a period of 4h. 30min. of the full 24 hours, so there might have been higher speeds even at this speed trap, which was positioned wrongly (unlike the one in qualifying, which was positioned correctly at post p8, hunaudieres restaurant, hence the higher top speeds). to be noted that the mercedes are significantly slower than the toyotas and the bmws in top speed terms (unlike in qualifying) because of the added downforce to the front of the cars to prevent what ultimately still happened. also surprising how close the bmws were in top speed to the toyotas, basically equal to the brundle car and faster than the katayama car. i expect the bmw to have hit at least the same top speeds at post p8 as they did in qualifying, which was 342 km/h, but i suspect they went even faster than that. the race setup of the bmw was much better in terms of performance than most people expected.

so with all that in mind, here they are:

339 km/h - Toyota TS020 no2
336 km/h - Toyota TS020 no1
336 km/h - BMW V12 LMR no17
336 km/h - Lola-Judd T98/10 no25
335 km/h - BMW V12 LMR no15
333 km/h - Toyota TS020 no3
332 km/h - Mercedes CLR no6
331 km/h - Audi R8C no9
331 km/h - Audi R8C no10
329 km/h - Panoz LMP-1 Roadster S no12
328 km/h - Audi R8R no8
328 km/h - Mercedes CLR no5
327 km/h - Audi R8R no7
327 km/h - Panoz LMP-1 Roadster S no11
327 km/h - Nissan-Courage C52 no21
326 km/h - Nissan R391 no22
324 km/h - Ferrari 333 SP no29
324 km/h - BMW V12 LM-98 no18
324 km/h - Lola-Ford T98/10 no27
322 km/h - Riley & Scott MKII/2 no32
320 km/h - Courage C52 no13
319 km/h - AutoExe LMP 99 no24
318 km/h - Lola-Ford T98/10 no26
314 km/h - Courage C50 no14
311 km/h - BMW V12 LM-98 no19
311 km/h - Riley & Scott MKIII/2 no31
FASTEST GTs:
304 km/h - Chrysler Viper GTS-R no51
298 km/h - Porsche 911 GT2 no64
287 km/h - Porsche 996 GT3 no81

so it is most probable that the cars reached around the same top speeds as in qualifying at post p8, before chicane no1 (except for mercedes, who added extra downforce to the cars to avoid them taking off), but they weren't measured there during the race.