I plan to replace the starter on my Suburban. When I go to BuyAutoParts.com, and fill in the make/model/year http://www.buyautoparts.com/selectpart/1998_GMC/Suburban/Starter/30-0.html
I get two choices for 5.7Liter. Once says SD255 and the other says PMGR. Do you know what these mean? Do you suggest a different way to determine the correct starter for my vehicle?