Ride, Wrench, Swap, Race
Join Date: Jan 2010
Location: Northern California
Posts: 9,194
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
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If you can find bearings that are 24mm ID x 35mm OD and 10mm wide,they could be pressed in to a depth of 5mm, and the width outside of the bearings would then be 86mm as needed to install the Shimano Hollowtech crank without spacers.
You could also press in the bearings to a slightly greater 7mm depth and use a 2mm spacer on each side to again replicate the 86mm width. You could make a spacer of any thickness to be used only during the press-fitting process to control the depth of the bearings in the frame.
The bearings by themselves are inexpensive, so this is what I would probably do if I could find the 24mm x 35mm bearing I needed.
So as I said before, it's a matter of finding the right bearing for the job, search effort required most likely outside of the bicycle industry.