the advert says "19mm spline spindle", most splined sprockets should fit; not to sure of the length of the evo og. spindle.
profile spindle for bmx's are usually 5 5/8" in length, while spindles from other manufacturers (taiwan) are most often 5 1/4", which is okay but watch your spacer usage.
i believe i read from somewhere that it's best to have 3/4 to 1/2 of the spindle left within the crank arm's spindle boss? from my own experience, taiwanese made titanium spindle are slighty smaller - making installation easier as the crank arms slide on; if there's less than 1/2 of the spindle within the arms, the tendency is of it to rattle loose.
best,
k