I have the Sears part number for the dryer vent; DS74A Skew 4396011 it is a 'wall hugger' and telescopes, (Periscope Vent extends 18"-29")reverses for any need, they sell a compact 90 ell for the top of it, but up there, a regular 90 will work.
I got an expandable vent line as well; part# DS74D Skew#4396009 Sears supplied as well, They are both Whirlpool parts.
Both Dura Safe Venting.
Pictures on first page of Ozz's Mods;
http://tiny.cc/Dryer72
Click on the first picture, makes it big, then just use the next picture arrow.
Hope it helps.
Ozz