That's way too nice of an S4 to be messing with straps over the wing. Just remove the front wheel and seat and put the bike inside the hatch.
Plus, why would you want to display a Raleigh on a Porsche 928, it should be a Cannondale, etc
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior
1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD**