It helps to have a dad with 42 years of experience in modifying and making all kinds of stuff for cars...

He found some part on some engine that looked like it can be a ram tube. So he brought it and we checked, and it's perfect! I have to add I've been scouring the Woolies and other shops with stainless cups and stuff nonstop for stainless egg holders, which when cut correctly also make the perfect ram tube...

Here's an unfinished one in the foreground and a finished one in the background.



He said the parts are stainless, we checked with a magnet too and they don't stick. They measure 43mm on the inside, so they are exactly the same size as the throttles and are about 70mm long. While their lips don't fold all the way around, I had another idea while we were checking if they fit. My dad said we can probably try to fold them further, but I said no leave them as is, their flow will be ok for when I want to drive without a plenum.