Larssens Motors in San Jose
Try Larssens Motors in San Jose, CR (near Centro).
They are a competent suspension shop, doing work with car racing and off-road motorcycle racing. They do sell Ohlins, but sell much more White Bros. shocks and others. You probably don't need an "Ohlins" spring - another brand would do. Either way, they should be able to help.
I have more contact info back with my stuff including Long/Lat info, I'll try to dig it up and email you, post it here as well.
Chiang Mai, Thailand