What carbs are these?

[dirkdiggler]

Hi

Just wondering if anyone knows what type of carbs these are? I never seen these before

 

[vomitspot]

sre

 

[dirkdiggler]

sre??

these measure 46mm at the bottom

 

[LIVE2RIDE Powersports]

The right one looks like a stock 46

 

[SUPERTUNE]

1st generation SRE's, or a copy of them...