1/8 x 1/4 x 2" long for the 300 Series impulse. I bought several Zama C1 kits (RB-1) through e-Bay last week, readily available and reasonably priced.
https://www.ebay.com/itm/Carburetor...h=item25ddd160f5:g:CCMAAOSwu4BVjG88:rk:2:pf:1
Mark
https://www.ebay.com/itm/Carburetor...h=item25ddd160f5:g:CCMAAOSwu4BVjG88:rk:2:pf:1
Mark