Stalled project, now finally completed.
Both kits are Revell. The black car showing the early style MK1 GTI with the metal bumpers and the red car showing the late style MK1 GTI with the larger plastic bumpers.
On the red car the stance was lowered a bit and I used a set of ATS Sport wheels from Renaissance Models. I also added some extra detail under the hood on both models.
The last pic is my own '79 GTI parked outside my parents house back in the 1980's ?