Glad you're sorting it out, however annoying it gets!
This is a straight cut bevel gear. If it looks bent in an way, it won't work. The pinion in your photo looks a bit worn! As the pinion line is co-axial with the spur gear line, and the tooth is not noticeably curved, only a straight cut bevel will work. Helical (spiral) bevels are used to increase tooth area contact, and hypoid bevels are used to lower the line of the input shaft in relation to the output shaft.
This is
helical (spiral) and further down the same page is hypoid bevel. As you can see, the spiral is very obvious. Both are very expensive to cut, and that's why the cheaper straight cut gears are used. HTH
Hope you get it sorted. Just being nosey, but when you say it's too big is it hitting the housing, or is the pinion bottoming out on the root of the spur gear?