I changed mine too. Slight issue is that with the 3 bolt type, options are slightly limited. I bought a 3-6 bolt adaptor which opens up many more possibilites. Got them both from Rally Nuts in Redditich - good quality and much less than demon Tweeks etc.
Have a look...


1928 Superaero Jap 3 wheeler
2013 5 speeder 3 wheeler