| Thread Size | Type | Engine | Part No. | Price | Buy | | 1/4-28 | Brass | Cont. O-470 | 21247 | $4.70 |
| | 5/16-24 | Brass | Cont. A-65, (C-75 to O-90, O-200, O-300) | 22022 | $1.14 |
| | 5/16-18 | Steel | Lycoming | 08-03639 | $2.15 |
| | 5/16-28 | Steel | Lycoming | 08-07455 | $9.50 |
| | 1/4-20 | Steel | Lycoming | 08-00547 | $2.55 |
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