M1XEP replacement suggestion?

[bucko]

My M1 Gold and M!XEP is working fine, even after 10+ years. But in advance of a XEP failure I wanted to throw out the question of a suitable replacement for the XEP. I would suspect the MTF of my XEP is coming soon and I want to have a backup

 

[Mark S.]

I bought a spare XEP and keep it in a box, just in case.