Air suspension for 250 W114

Hello guys, I have a question. I would like to install an airride in my Mercedes W114. Chassis of HighestLow and air production and air management of Accuair. (Endo CVT tank and e-level) is the current plan If the chassis itself has a part inspection, I need one for the rest? (in case of doubt individual acceptance) Second question regarding H-marks.. I have already seen some W115/W114 showing oldtimer with airride and H-marks. Has someone had experiences or has relations with the nice gentlemen of TÜV. (best of all South-East Germany/Low Bavaria) Thank you Jonas