The F109 is basically a set of hop up parts for the F103 that have had a chassis made to join them all together. The rear axle spacing is the same as I stated above.
As for the rear ride height adjusters, as I said earlier you need to open out the holes in the HPI adapters to get the F109 bearings to fit in them. The holes in the HPI adapters are made for 3/8" bearings, which are 9.5mm so you can enlarge them with a 10mm drill, then use a pair of 6 x 10mm flanged bearings to fit the axle into the HPI.
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