Personally, I prefer the looks of the staggered 16" Alpinas. To me, the 16's just have the correct proportional appearance, just the right amount of rims and tires. Even today, 16" high performance tires are readily available from every manufacture. The 16" rims were designed by Alpina mainly for the later 6 and 5 series car in the mid and late 1970's but Alpina probably also had the CS fitment in mine during their initial design process.
As for the 14" Alpinas, period correct aside, they have the appearance of just too much tire, too much sidewall height. The original 14" Alpina setup was just a tad too wide for the stock fenders hence the neccessity for the Factory Chromed wheel arch. Pretty sure others have noticed the slight protruding rims/tires on these cars. The ride height of the CSL's that left the factory were overly high, the primary reason for this probably was not to have the overly wide rims/tires hit the fenders. I may be wrong but lowered CS will probably not work with the 14x7" rims and tires setup.
Hate to nitpick but what is so period correct about 14x7" Alpinas and the inexpensive and rather mid performance mostly Asian made 14" tires that are only available now? These rims with period Michelin Xas tires, YES!!!
Bert