So my understanding of these two alloys is as follows

RS alloys have a thick webbing around the bolt holes and are secured with flat washered nuts.
Laser alloys have thinner webbing around bolt holds and are secured with conical nuts.
Now my car has M12 studs and both types of alloy has a bolt hole of 3/4" ,so the fit here is a tad baggy.
Now I can get flat washered nuts with a 20mm long 3/4" spacer but not the conical one.
Now it's seems strange that the laser alloy (conical) has a small conical face area,more like a chamfer.
The RSalloy (flat washered) has a large conical face.
So maybe my understanding is back to front.
In engineering terms the escort read axle has no length to the hub centre and with a 5 mm spacer on the front hub
The support in the middle is iffy.
In both cases would a 10mm concentric hub spacer be the answer.
Now for the come clean,I have three rs and one laser which came on the car.
It's in build progress,purchased as unfinished project.
Await your replies with interest.

You have it the wrong way round.
RS alloys have the thinner webbing and use the flat washers.
Capri Laser alloys have thicker webbing and use tapered nuts.
The RS wheels are rarer (more expensive), but you might get lucky and find a single one for a sensible price!

Toyota oe alloy wheel nuts are a good replacement for the original rs flat washer nuts, pretty much identical in washer and shoulder dimensions.
The taper fit ones are just standard ford items, they're still used on current fords and should be easy enough to find replacements.

With the wheels, you'll need to match the part number to make sure your offset and width match, as there are several different proper rs alloys. In addition, if you've got the mk1 rs1800 ones(H71AB 1007 AC), the capri jps ones are identical except for a different centre bore.(H71AB 1007 AC-C)

There are also some 'ats' copies, which are thinner than the laser spokes but still fit with taper nuts.

Dave

I spotted this list on facebook, covers the most common rs 4 spoke alloys.

Wheel type Size Part no / identification marks in casting
Offset (mm), centre cap hole size, type Wheel nuts

Mk1 Escort RS alloy 5,5J x 13” H71AB-1007-AC
ET + 19, 70mm rear fit, Flat washer

Mk2 Capri JPS alloy 5,5J x 13” H71AB-1007-AC-C
ET + 19, 63mm front fit, Flat washer

Mk1 Escort RS alloy 5,5J x 13” H73AB-1007-AD
ET + 19, 56mm front fit, Flat washer

Mk2 Escort RS alloy 6J x 13” H75AB-1007-FA
ET + 19, 57mm front fit, Flat washer

Mk2 Escort RS alloy 6J x 13” H75EG-1007-BA
ET + 19, 57mm front fit, Flat washer

Capri Laser alloy 6J x 13” H81EB - AA
ET + 19, 57mm front fit, Taper nut

X-Pack alloy 7J x 13” H76FG-1007-AB
ET + 5, 57mm front fit, Flat washer

X-Pack alloy 7.5J x 13” H75AB-1007-AA or H75EG-1007-AA
ET - 19, 57mm front fit, Flat washer

Mk1 Escort RS group 1 6J x 13” H71EB-1007-AA
ET 11-12, 70mm rear fit, Flat washer
(note: these wheels are also Pre facelift Capri RS2600 wheels)

Mk2 Escort RS group 1 6J x 13” H75AB-1007-BA
ET + 5, 57mm front fit, Flat washer

Capri /Escort 6J x 13” H78EB-1007-AA
ET + 5, 57mm front fit, Flat washer

Capri RS3100 & RS2600 6J x 13” H73EB-1007-AA
ET + 33, 57mm front fit, Flat washer
facelift Capri (on rear face) all are 1973 date stamped

Fiesta Super sport 6J x 13” 80FB AA
ET + 32, 57mm front fit, Taper stud

Fiesta Super sport series X 6J x 13” H76FG-1007-AA
ET + 32, 57mm front fit, Flat washer


Dave