I have a Kona with marzocchi bombers Z1 with formula tabs. I need a disc brake that will fit as I would like to be able to stop. Just having a back break is a little too exciting for me. Not bothered what it is or how pretty would just like to stop
I'm affraid You're not having to many options...
Only early Formulas will fits to Your fork witthout any shims/converters - that's just their own standard...
Some early formula brakes You can find also branded as a Corratec
See here, You'll know what You should looking for viewtopic.php?f=7&t=225254