I have a feeling that the MK1/MK2 Crosman 1322 had the same bolt as the 140 --- that's if it's just the brass bolt you're after ?
There are two different safety catches on the 140, the early one went through the stock, the later one was in the trigger guard.
If your safety goes through the trigger guard I think the SMK QB 78/79 has the same part.
Member, Ped, may be able to confirm the above ?
All the best Mick