Wanted: Flare pistol double barrel DDR LP2 parts

hello: I am looking for internal parts for a post WW 2 East German double barrelled flare pistol in 26.5 mm. I have the barrel and receiver and grips, see attached image, looking for hammer, trigger, barrel release lever, mainsprings, bolts and screws  etc. Unlike the WW 2 doppelgeshutz this postwar flare gun had external hammers , double triggers and some other signifiiant differences, so parts are not interchangeable.