I am changing my dual crown fork set up from a Boxer to a Manitou Dorado but the caliper mounting holes are very different. The dorado has 29mm + or - and the Boxer has 74mm spacing. I have Hope brakes. The Dorado is a 2015 fork and the Boxer is a 2017, I didn't expect to run into this problem with the age of the 2 forks being close. Does anyone have any solutions for me? I have looked at all of the mail order sites and all I fine are spacers to run a oversize rotor.
You need specific Manitou Dorado brake mounts that then become Postmount (the 74mm spacing you had on the Boxxer), like those : https://www.shockcraft.co.nz/dorado-brake-adapter-74-mm-post-manitou.html
They should have been included with the fork, can you check with the place/person you bought it from if they don't have it somewhere?
Or you can contact Manitou directely and see if you can buy one from them.