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I saw a mount of a RACE booster strap by 1) remove boot liner, 2) put a block of wood or something in to spread the shell cuff / collar, 3) drill out the rivet from the boot shell 4) out comes the old strap 4) depending on the booster strap match to the old rivet hole -mount or drill or melt new holes as needed.
Some people use hot nails to melt thru the shell cuff and if the strap needs a hole they use a hot nail to seal it...
questions@skimetrix.com email for booster......ask them http://www.skimetrix.com/landing.html they also a ph number.....
I don't know your strap model and don't know SPK boots...
just off the website
forgot this link http://www.skimetrix.com/instruction.html ... http://www.skimetrix.com/instructionimgs/instructionvid.swf
[IMG]skimetrix.com/instructionimgs/bottomSplics.gif[/IMG]