Back in 2002, my tool and die making neighbor made me a similar spacer out of 3/8'' aluminum plate (9.525mm) using an EDM machine (wire-cutting). Turned out great. Only difference from Elvis' piece is that it used a separate bushing for the center bolt, and I just silicon-ed that to the stock cover.
Seemed to add some low end to my 2002 300XC, and was pretty trick at the time. I later had a chance to get a real deal on a Checkpoint PV cover and am using that now. I think I may still have the spacer in my spares box if anyone is interested.
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 "Conviction is a luxury of those on the sidelines."
'13 Beta 300RR - race bike
'02 GG300XC - "Billie Baroo"
'01 DR650
'02 GG 280 Pro
'06 YZ 250
'07 WR450
'00 TT125RL
'94 YZ200 - custom keeper
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