I own a Colt M1991A1 Compact SS w/ a 3.5" barrel. For all intents & purposes, it is the same as the Colt Officer's Model .45 ACP. I would like to replace the stock spring, guide rod & plug w/ a full length guide rod & reverse plug. Ideally I'd like to purchase a kit containing all three parts, & drop it in w/ little to no "fitting" required. Your suggestions on this matter will be greatly appreciated.