use your engines model numbers to search the parts listings, they will show if it was a Bearing or bushing (typically the ball bearing was not used on the HS40 basic recreational engines but was factory standard on the HS50 rec spec engines) there are carb breakdowns as well in the parts lisitings which can usually figure out which fuel inlet they used. Have to do some searching sometimes of the part numbers to find photos (like NOS parts being sold on ebay) since some of the stuff is NLA or not shown in an actual photo.