I've been visiting this forum for a long time and this could well be the first time i could be of some help. I have the original Thai release of Ong Bak and also a fan subbed(i think dutch, english, french, german poorly translated btw) version of the Thai DVD release. I think both are in PAL format. If you want me to look these up to see if there's anything useful on the discs for you let me know.

Update: unsubbed disc: anamorphic, running time 1h44m (PAL) so probably the same cut as you have. It has a 5.1 ac3 soundtrack, 338 Megabytes in size. As far as i know this is the disc as it was first released in Thailand. It has all the original menus which are in Thai and English which is strange as the movie itself has no subtitles.

Subbed disc: anamorphic, running time 1h44m (PAL), 5.1 AC3 soundtrack 340 MB in size. Like i said this one has fan made subs in Dutch, English, German and French.

Also, if you want to have subtitles checked or added let me know, i know many Thai people.