Hi:
Many thanks to everyone, to RNinMunich, River Rat, jimdogge...
We will try to buy everything at Krick.de, because from Germany, the shipping and customs costs are much less and the shipping is faster
Again, thanks for your excellent and quick responses.
Neil, thanks for your advice.

Hi Julio,

I 3D print a lot of things including boats, and have an Aeronaut Classic, but I wouldn’t use 3D printed parts on the exterior, for such a class ice boat like a Riva you need metal parts to make it look correct. The suggested companies are mostly ones I would recommend too, also check Aeronaut out.

Good luck
Neil

Hola Julio,
Take a look here.
You can either buy a complete set or pick out individual items.
I used them to jazz up my restored Sea Scout, they're good quality and Krick deliver promptly. They are my main supplier here in Germany.
Saludos, Doug😎

https://www.krickshop.de/Accessories-Spare-Parts/Accessories-for-Ship-Models/Fittings-for-Runabouts-1-10.htm?shop=krick_e&SessionId=&a=catalog&p=166

Hello Julio, I see you are in Spain, I am in the USA, we have a company in Arizona named Dumas products. They sell complete chrome sets for Chris Craft boats in 1/8 scale that should work for your friend. I have used several sets of them on 1/10 models. I don't know about shipping cost but they ship worldwide. Very helpful company. We also have MACK rc products that sell all the lights and fittings separately, both of them are easy to find on the internet. I have also seen vintage sets for Billings, Dumas and Sterling kits on Ebay. Good luck in your quest ! Dave RR

Hi julio im sure if you go onto the Amati site you can buy sets of the air intakes and cleats. you may also be able to buy a complete set of the small metal parts for your friends Riva.
Good luck. Jim