$18
Maybe you have an Erlen rack from the time they came with one bolt? Lost the spares that came with the next round? of just need longer bolts?
This is a full set, 2@M5, 2@M6 1@M7 and 1@M8. this should cover the bases for "Most" seat posts that people using an Erlen rack would encounter.
For reference, some common posts and their bolts:
$120
Update: 9/21/20 Nitto and Blue Lug stoked us out with a surprise order, inventory is current. ...
Sold Out - $75 $95
This is the benchmark for one bolt posts....simple, elegant and just works. This is also...
$190 $195
Update: 8/18/20 We have sold through the spring stock of racks, as have our dealers. The...