The second method is to use helicoils to reduce the 5/16-24 threads in the mounting holes down to 1/4-24 and use the stock bolts

Chrome plated flat socket screws and companion countersunk washers fit 1973-up FL

Cycle Standard offers this quality replacement 10 Hole Clutch Pressure Plate for 1941-1984 Harley-Davidson Big Twins

providing the highest level of bike control available in an aftermarket Harley-Davidson seat

Made in the USA

#2534-19 Primary Cover Acorn Mounting Kit 2007-Up Harley-Davidson FLT - Chrome Plated Nut Type_Lock Nut The second method is toChrome plated acorn nuts mount primary cover on 2007 up FLT. Made in Ohio, USA.