didn’t know you could chip a 450 cos they have the mechanical pump supose you could play with the pump, 470 and 500 had the electrics, maybe i’m wrong 
the truck started life at roadways container haulage , it was a red 143 450. if im not mistaken..and no the centurions were only available j,k,l, reg , taylors of martley had 5 or 6 113 360 twinsteer centurions, they were not just limited to 143 500s the centurion spec was available on any 113/143 chassis.
How many did they build?
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If i remember right didn`t they build 100, and number 100 was a bit special
They built 100 to mark Scanias 100 years from 1891 to 1991.
They were available as 113 and 143 but i think only with an R-cab.
It does seem they were available in male and female versions as they do seem to have been breeding in recent years
and my mate who is a Volvo fan has a standing joke that there was 150 of the 100 made at Peterborough truck show
last year 
Kerbey motors is a 1996 as far as im aware and i doubt very much it is the only one with some badge trickery but hey
fair play to them it’s a fine machine and in my humble opinion a nice example of the best truck ever made 