My proyect and Problem crackset

Hello, members of the fixed gear community. I would like to show you my bicycle, which is still a work in progress. Here are the specifications:

-Privitera frame set (one inch ahead, 2005 model – aluminum tubing)

-Period-correct Miche headset

-Wheelset: Trabocchi 20AG front and rear, Alex Rims GD30 rims

-Izumi black jet 410 chain

-Vittoria Zaffiro Pro Kevlar 700×25 tires

-Trabocchi 15t sprocket

-Pampa bikes 7075 t6 aluminum 144bcd 49T chainring (hardness tested)

-Standard aluminum pedals

-Shun 165mm cranksets (broken)

-Bottom Crank/bb Sram Italian record cup 36mm right-right thread

-Magnetta 420mm carbon fiber handlebar

-Zoom 90mm stem

-Bike Plus 26.8 seatpost

-Velo race seat

Future parts:

Dure Ace 26.8 seatpost

Sram Omnium cranksets or others

Selle Italia carbon seat

Thomson stem or others

Pedals Automatic

I have a problem with the cranksets because I don't know which brand to buy or choose. In Argentina, there aren't as many options as in other countries!