No idea…those T-34-85, €21 euro tracks aka $25 US, ended up costing me $48 by the time VAT tax, regular tax, rich tax then poor tax, modeler tax, etc tax were all applied plus transaction fee & shipping.
Based on the number of spare links, it appears three sets of T-34-85 tracks will produce enough spare links to build one extr track.
That includes subtracting out 5 links for the front of the hull for each set and a 3 to 5 link defect rate roughly per set.
Buy six sets and combine the spares for a free 7th set 
Top run is from left links from two sets. Bottom run is length needed for typical T-34-85
Eventually one of these years, I’m going to cobble together a free set of Fruils from spares
