Based on this product's specifications, here are some alternatives and similar models
Mounting bracket for rectangular PVC duct 110×55 mm, airRoxy 02-410, pack of 2
Summary description:
Mounting bracket set by airRoxy (model 02-410) designed for rectangular PVC ventilation ducts sized 110×55 mm. Supplied as a pack of 2 brackets, these fittings secure ducts to walls or ceilings and provide stable support for indoor ventilation runs. Suitable for residential and light commercial HVAC installations where rectangular PVC ductwork is used.