The pair have been excellent for Hull since arriving last month.
Bruce said: "They will help us not just as players but because of the work and attitudes they have got. They are a good folds for each other, and we have got to find a system of playing two strikers up top because not many do. I have always said you are only as good as your strikers and those two are very good for us, especially as a newly promoted side.
"We tried in the summer for Long and kept persevering, kept on at him. It was terrific to get him. I was shocked, really shocked because I thought we would have more competition but the kid wanted to come to us."