WTF with the 5 x 4 BC and getting axles?

anyone with a 5x4 bp thinking about some great looking wheels, check out
coys wheels .com. they sell their own brand plus most others. i have their
c-5 wheels ( 5x4) on my 72 demon. 17"x7" with 4 1/2" back spacing.
look fantastic. really make a diff. oh, tires size i have is 225/50/17. same o.d.
as orig. , about 1 1/4" wider. clears everything fine.
jerry