Banana split ? Rust free import is where you wanna be .... Not sure it will fit either .......how much are new ones ?
I've done a few Brazilian buses and if I remember right its also got a splitty Idler pin that wears quickly and is an absolute Git to replace.
Keep your eyes open I've had 2 off fleabay !! Paid £280 for a supposadly rust free us import that just needed cleaning up and painting to find it had been welded B4 and had 3 small holes in it. I was stockpiling parts at the time so I'd had it for 6 months so was stuck with it. I repaired and painted it and sold it back on fleabay for £180. I then bought a second truly solid beam again from fleabay for £80 it's now on my bus so you will get 1 if you can hold out.
I've got a LHD beam that I was asking £300 for... I need to remove it to double check that it's rust free, but the rest of the underside is pretty my rot free, so I'm pretty confident!!
If you haven't managed to get a beam a friend of mine has a complete beam ,disc to disc including callipers for sale. There is no rot and has not been welded. He has parcially sand blasted it ,etch primed and rust proofed it. £400. If you are interested let me know and will take photo's and send to you. Live in North East England near Durham and would prefer collection so you can see what you are getting but can send by carrier at your cost.Goes with out saying ,money back if not satisfied. Robert