O.K. I scoured the internet and found the delphi fp10153 and the SMP FP262 fuel pressure regulator numbers for the buells. Problem is I ordered one which was a smp fp211 by mistake so I sent it back for the smp fp262 Neither fit tight enough in the hole in the fuel pump assembly. Both of them sit too low for the screws to keep it down. Im frustrated now because I cannot find the right regulator. The 262 I got today is even worse of a fit than the 211. What are you guys using? Anyone?