Firstly ...... please don't bend your Strada rallying. There are so few left. We have done over 6000 tracks miles / sprints etc. some sessions as long as 153 laps / 288 miles all trouble and damage free. Hope you fare as well.
Regarding the front struts then you could remove one, measure the dimensions, mounting holes, clearances etc. take some pictures and look for other/coilover replacements.
Rear could be more tricky due to the leaf spring setup (affects the top turret) but a replacment coilover with no spring should work.
A lot will depend on your "class" in the Rally regs regarding modifications etc.