Johnboy Richter

Johnboy Richter here, I am new and would like to ask if anyone has any experience with the many diferent sizes of needles for the Singer 7-33. I have a needle on it (but I think it is for canvas ) and could take it to a local sewing store if I were home. ( I work off shore ) I looked all over the internet tryng to find cross reference charts and or specific needles for sale and could not make any sense of it. I have a GA5-1 and it does well but it does not have a walking foot and I dont want to mar the veg tan leather I am lining belts with. anyway, any help with finding good leather working needles would be greatly appreciated. R/jcr