Seems like I remember a post sometime ago that caught my eye(I have a 64' K10) some one had used the whole front axle and steering as GMCpanel suggested. Possibly it was was from a 70' or 71'? I believe they used the master cylinder and proportioning valve from the same parts truck? You will have to be sure the axle ratio is same as what you will be replacing. Bolt pattern and axle diameter should be the same. I have swapped rims between my 71K10 & my 64K10, they were a match. Good Luck