This is the only form that the Thai Embassy in Vientiane and the Thai Consulate in Savannahketh use for ALL of their visas. 57d7849dd469e_Savannakhet2501-01-31.PDF
GL - please check the referenced form. I am unable to open that PDF document - error "This XML file does not appear to have any style information associated with it."
Mind you with the second link. You have to have an open Thai Visa login. I have not logged in for over 3 years but my laptop remembered my pass lucky for me.