Steering column wows

[hopelessredneck]

So i while back my brother gave me a tilt column out of his 80 k20 he parts truck and nothing was wrong with it and now when i finaly get to installing is the key wouldnt budge to i pulled it apart thinking the lock cylinder was seized just to find out that there is nothing wrong with it so i grabed pliers and tried to turn the ignition over to no avail so then i droped the column to check the ignition rod that goes to the switch and it wont budge so im think in that its the cam gear thingy that is seized or broken so i go to pull it apart further and have all the fastners out of the top cover but it wont come off and im ready to punch out a window (just quit cold turkey 2weeks ago aint helping ether) any ideas or detailed instructions would be a god send and brownie points to who ever can tell me the diffrence between these two lock cylinders other then one uses a pin to hold it in compared to push tab what year or truck/blaser/suburabn would this go to my lps cant figure it out they tell me there is only the bottem one for 67-87 gm C/k series