Regarding the white car with the rallye lights etc. Dr K in the new RS book (page 43) has that one tagged as 911 230 1144. On the Pbase site it is shown as #1019 as you state. I am not sure which is correct BUT it certainly does look like one of the two cars shown on the original documents went to Spain not Sweden. I had not made the connection to that Zoll plate number 857 Z 4481. I have that shown as Julio Gargallo & Jaime Ramón. and the photo you posted as the 1972 rallye Bosch. It is also shown as a 2.5ST.
Here are some other photos of it.
regarding the Kuberol car(s) the records I have show them with 2 cars at almost every main event. One is entered as a T and the other an S in the same number groupings as the 2.5M491 cars. It is possible that one was a real one and the T was a car made from a factory kit, or indeed that both were factory kit cars. However I suspect one was a real one given the distinctive front spoiler shape that only seems to be on these cars - at least in 1972.
That was a great pickup on the roll bar. I will have to go through my photos and entry lists to see if i can match one consistently to the roll bar or if both the cars entered as a T or an S had it.
On the photos shown the back side of the car was at Estoril but no race number is shown so the car cant be identified- at least by me (the other car is Horst Klauke's 911T entered in GT2.0) Kubero had the T (GT2.0) with Simonsen as car 83 and Ekberg in the S as car 65 (GT+2.0) in that event.
The next car I am not sure if it is car 82 or 52 so i will have to check, but as it is a willi weber photo it is likely to be Nurburgring and it looks like it may be #82 at the Nurburgring 1000Kms in May where car #82 was entered as a T for Ekberg / Biström / Simonsen.
The#8 car was at the Nurburgring as round 5 of the EC GT on 29 July 1972. Car #8 was Larsson in the S in GT+2.0 and the other Kuberol car was #26 for Simonsen in the T.
Finally 123 was 1n April 1973 at the Nurburgring 300 It was Simonsen now in the S in GT3.0 class which is likley to be the same S as in 1972.