Wrecking yards for aircraft worry me. Maybe because I've spent too much time in automotive wreckers.
I have visions of sitting in the departure lounge because my flights been grounded due to a technical problem and down in maintenance a bloke is on the phone...
"G'day Bob, it's Macca from Qantas maintenance"
"you got a fuel pump for a 93 747, the ones with the Roll Royce engines"
"I've got a 98 and I think I've got a 87 ready to go. I think there's an old 93 down the back of the yard. I'll send the young bloke down their after smoko and check for ya"
"Na mate, I need it now. Will the 98 model fit"
"The brackets are different, but if you re-drill em and file the other end back she'll be right"
"That'll do, can you get your young bloke to throw it in the ute and get it down here"