To preface, only selling these 2 because I’m buying a new strap that’s a little pricey. Yes the FKM strap is for the HydroConquest GMT 41mm but it fits the Spirit Zulu Time 39mm perfectly. 1. The strap was bought from my AD directly a few months ago. Right now it’s priced for $430 at longines website. It’s FKM, tapers from 21mm to 18mm, has an awesome on-the-fly adjustment system and is extremely comfortable. here is how it looks on the Zulu time 39mm: https://www.reddit.com/r/Longineswatches/s/2x6ablGlTg 2. The bracelet from uncle straps is sick! Bought last month when it was released for $99. Its tapers also from 21mm to 18mm, finished well, and has female end-links. Here is how it looks on the Zulu Time 39mm: https://www.reddit.com/r/Longineswatches/s/qDb7EetFgI Asking for $260 for the strap and $75 for the bracelet. Shipping on me USA only. Can meet locally in the Twin cities MN as well!