I sent off an email to Merle to see what he says. The crankcase width of the Saito (1.81") falls in between all the OS/YS specs of 1.75 to 1.90 so that's not a problem, but I've seen pictures of these mounts with capscrews already tapped into the beams. I want to make sure my engine bolts in cleanly. I've also ripped out all the crushed and fuel soaked plywood up front and will make a new firewall assembly so engine spacing won't be a problem either.