PLM Header Assembly Hardware Bolts Nuts

PLM Header Assembly Hardware Kit Fitment: PLM Headers that utilize slip-fit collectors B-Series, K-Series, D-Series Replacement for all stock hardware to screw in studs with machined nuts Kit Includes: 2 bolts 2 nuts (4 nuts for the long version)  Features: 8.8 grade or higher quality bolts Direct replacement Short bolt is 2 3/8" inches in length Long bolt is 3 1/2" inches in length Which one do you need, short or long?  Most PLM headers utilize the short version.  Once the slip-fit collector is fully inserted, the short version hardware fits perfectly.  On rare use cases, such as the H-Series Ramhorn header, where the 4-1 merge collector needs more adjustability, you will need the long version to allow more play in the slip-fit collector.