Engine Compartment Blower Hose, L&R Where to Buy Options

[NARP74]

I borrowed this pic from @skota23 in another topic. Does anyone know where to buy the hoses like this? I have seen and tried others but they have issues and I wanted to try these.

[wonkipop]

here is page from 411/412 parts catalogue.
had it filed away.

the original mod, whether by dealer or by owners back in the day, was sourcing parts from VW book. you can see all the bits. duct splitter. the stand off clamp. though i was wrong about attaching it to cooling fan casting in 412 variant. variant used the standoff clamp to hang the motor from underside of top of engine bay sheetmetal. for 914s they just used the clamp to support the hose and fixed it to one of the nuts on the fan casting. and they used the long hose.

none of this is there in 914 PET. all it lists is "additional blower" (ie later blower) and one short length of duct at 450mm. the only thing special to the 914 was it did use a transition piece out of the variant fan that was rectangular to circular for the single circular hose.