Question about M Parallels

[M3sRsick]

Hey guys, i have a question about dropping M Parallels onto a e36 m3. You guys are probably thinking that this topic has been beaten to death but this is a very different question. My car has gone some changes in the rear in the last few months and now fits a 15mm offset in the rear, In fact anything else just won't look right since my fenders are flared out to fit this setup. Now the problem is that the M Parallels come in a 26mm offset so i was wondering if adding 12mm H&R spacers would increase my offset to a 14mm which would fit just fine as long as the tires were just a little tighter. Does this work or am i completely off my rocker. Im guessing it works since the spacers job is to bring the edge of the rim closer to the fender and further from the hub. I know that the actuall offset would not change but would it fit like a 14mm offset under my fenders? whew, i know this is confusing and wat not but if u think i know where im goin, even if u dont' just reply and give me ur insight, I am very grateful too those who do. Anyways thanks guys hope to hear from you. :astromile