I took the plunge and bought the EZ Car Lift from Holden. They, and EZ, recommend the Cross Spacer Set - Working Range 66 to 97cm Wide for Morgans from 1951 - 2004
Despite the promotional videos I cannot slip the car lift under the car except from the side. The width using the recommended cross spacer is 1075mm and the distance between the inner walls of the tyres is 1030mm.
I did wonder whether to change the cross spacers for the 56 - 89cm pair which would still be suitable for my chassis (86cm) but the rollers would still be too wide to slip between the tyres. I shall make up a couple of drive over ramps then I won't have to take the lift apart to store. Later Morgans have a wider track, although I don't know when the change was made.
Having said all that I was very impressed with Holden. I ordered the lift on 6th June, it was delivered by DHL Express on Friday 7th June.
I don't know what Holden offer for accessories to the EZ Car Lift but there is the Limited Space Kit available here in the US which might help you. You could easily make your own.
https://www.ezcarlift.com/accessories/LSK/limitedspacekit.php
