The 245/40/19 should fit the Hartge 8" wide without any issue. Offset - as indicated.
Offset is only refer to the rims ... has no relation to the size of the tires.
Based on the Hartge spec. - (in comparison to the stock spec.) .... The new wheel setup will give you:
4mm closer to the suspension/brake component - which is within acceptable allowance to clear the mentioned.
Before you proceed to buy the rims, you should also double check with the wheel/tire shop to make sure of any (brakes/suspension) clearance issue.
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