Best value for money itb’s

[Mitch.W]

Hi all, 

I’m currently looking at getting some itb’s for a new project, I’m needing something around 50-51mm in diameter needing in a set of 4 ideally. 

does anyone know of any motorcycle itb’s, or something off a random car that are around this? I know there is aftermarket options but I have short arms and deep pockets. 
I’m aware bmw s54 etc but again, spendy… 

has anyone delved into this hard and come out with any good options? 

[jessemk2]

I think gsxr1000 and busa itbs are 48mm at throttle plate

You might find  Ducati around that size but you need 2 sets

Early fuel injected crf450r  had a 50mm throttle body