factory chevy wheels

[new to this]

Ok i need some help. the last time i posted here i had just installed one of those after market rear disc brake conversions and i had been working so much that i had not had a chance to do anything to the truck till now. what i have found is the after market kit does not fit like it should(it's like the brake caliper is not wide enough for the brake pads and the rotor) so what i have done is i found a factory 2001 chevy silverado z71 4x4 and i plan on putting it in the 69 c10 . but one of the things i noticed is that the 15 inch wheels i have will not be big enough for the calipers. so i started to look at some factory chevy wheels and i have found a few wheels that i like but i do not know what size wheels will fit in the front fenders( i figure i will need to run spacers behind the wheels but i do not want to hit the fenders. these are some of the wheels i am looking at:




the last picture is a set i seen on CL for $80 for the rimes lug nut and center caps but they are 18 inch but i do not know if they will fit with out any problems.