Hi, (this is andy @ PLUK using greig's login). You all might find this link useful.
Its from a manufacturer in the US and explains the reman. guide/handling of the ibutton http://cxilamps.com/images/StrykerReplacementModules.pdf
To my knowledge only 2 manufacturers offer this full OEM product (because the lamp is a C type elliptical lamp and not prefocused - its normally best to stick with a pre-apperture set module's)
Luxtel and Excelitas (previously known as Perkin Elmer).
Excelitas, who manufacture the original lamp for Stryker, are OEM only in Europe, and dont sell to you and me in the aftermarket. Thankfully they dont apply the same rule to the US, so if you know where to look (and are an expert medical lamp distributor) you can source them... Ahem...