Disc brakes with 15" rims ?

[67chevemall]

Hello ... I am wondering when GM switched to Disc brakes up front did they leave the 15" rim as stock. Or did they have to switch to 16" rim to fit the discs...
It is probabaly the spindles not the disc brake that is the issue.

I am going to put drop spindels and disc brakes on the front. I hear I won't be able to use my 15" rims once I do this....

I have 18's that will work but really like the 15" rim with MT's and dog dish look too.

If I can't use my 15" rims once I convert I will have to drink a case and think about this....

Thanks for any info in advance..