Är 15/16 nyckel till hjulmuttrarana, dvs lite mer än 24mm även om 24 hylsa funkar.   Antar att bultarna är 7/16 UNF någon som vet längd?   7/16 är väl 11,1mm så M10 snurrar väl bara runt?  

Not sure, but you might find some answers here: Rare Rides: A Serious All-terrain Truck From Volvo, the 1979 C202 Laplander | The Truth About Cars

Thank you for these tips.   Yes there are single Weber upgrade carbs - like the DCD - much much better than the old original - so less fuel consumtion, better run, more torque - I know it already from my Amazon.   I think such one - is a good choice for normal daily use - where you maybee dont need a double carb - like for a sunday car.   I would use the same type at the B20A - which I would like to build in. At a car like my L3315 - I think double carbs...are not the right choice - keep it working & simple - thats how I think when it is about my L3315.   Still hope - that somebody got documnets about a original one with B20 engine...

Some 903/3314 documents can you find here:      

I don't know if you're familiar with this replacement camshaft: https://shop.klracing.se/sv/artiklar/k-kamaxel-b20.html It was said to give better torque from low engine speed and still not give you a racing engine, responding well only in the higher revs.   I am not familiar with Weber carb replacements. The civilian B20's normally came with a Zenit-Stromberg and some could be equipped with twin SU's, which gave a definite extra punch to the driving, but I suppose there may be physical limits in the engine compartment that could prevent the use of horizontal carbs.