Type 1 Which timer fits a Sanofi Juniorstar pen?

Hi
I’m about to use a Juniorstar pen for my Lantus but with my previous Solostar pen I had a Timesulin device to time since my last insulin dose. The new Juniorstar is a different size and I can’t seem to find a pen timer to fit it. Does anyone know of one please? I don’t feel comfortable without a timer as on occasions I’ve forgotten whether I’ve taken my injection or not. Thanks

Thank you for that info. I have a reminder alarm on my phone but good idea to put a timer on too. Thanks