2 options:

1. Stretch the Miyata frame to 135mm which will require re-alignment of the dropouts or:

2. Respace the hub (if possible) down to a more compatible width. Surly hubs have replaceable threaded axles and they appear to have commom hub shells so you may be able to take a spacers to bring it down to Surly's 130mm size to minimize stretch on the Miyata frame