A/C question

[Delorean17@xxxx]

Hi,
My AC system was working fine but unfortunately I had to vacuum the R12 
out while cleaning out my evaporator box. A friend of mine is letting me use 
his 30lb tank of R12 to refill the system next week. Before I re-charge it, 
what parts in the system should I replace? Last time it was charged I had it 
leak tested and none were found so hopefully it hasn't changed. I would 
really appreciate any info on what I should replace and where I can get the 
parts.

Thank You

Dave