Hi Dennis,

I use the X43.6mm airtite. They hold the strikes secure and look great. Model X tubes are utilized with the holders for storage. I source both on Amazon from OnFireGuy. Great shipping and service from OFG.

Holders
https://amazon.com/gp/product/B01MTWLT80/

Holders and Tubes
https://amazon.com/gp/product/B07BL45NGX/

Shane