window regulators

[jimmygee]

Can any one help me install window regulators. I spent 4 hours yesterday trying to and just can't get the center bracket in position. The door skin bracket seems like it's preventing the aft window arm from dropping low enough to postion the bracket. There must be a trick or I have the wrong regulator. When I bought this truck I was told it was a 53 (Titled as a 53)with older doors. From everything I've read they appear to be 47-50 doors because of the regulators. Thanks in advance.