Hayman Reece Discovery 1/2 01761R Heavy Duty Towbar installation instructions

[twr7cx]

Anyone have a set of installation instructions (or one installed that you can look at) for the Hayman Reece 01761R Heavy Duty Towbar to suit Discovery 1 and 2 < Hayman Reese - 01761R - haymanreese (http://www.haymanreese.com.au/parts/01761r-3578555) >?

https://www.aulro.com/afvb/images/imported/2018/01/1053.jpg

What I am wanting to know about is the two extra mounting bolts on either end:

https://www.aulro.com/afvb/images/imported/2018/01/1054.jpg

How do these mount onto the vehicle? I had a look at my 03 D2a TD5 HSE and it seems to have only a very small hole in the rear body there. Are these to be drilled out? If so, how does the nut get put at the top (tight/restrictive space wise) for the bolt to thread in?

[AK83]

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How do these mount onto the vehicle? I had a look at my 03 D2a TD5 HSE and it seems to have only a very small hole in the rear body there. Are these to be drilled out? If so, how does the nut get put at the top (tight/restrictive space wise) for the bolt to thread in?

I have a D1 and a couple of D2s

D1 has an 'ARB Towmaster' towbar which has a very similar design to the Hayman Reese type, with the two additional mount points at the far ends.
Can't see exactly what bolts were used(ie. shank size) at those two points, but the heads are the same size as the two central bolt heads, both use 5/8's heads.

D2s both have Landrover towbars which don't use that mount system, and only use the two central mount points.

I only have one of my two D2s in pieces, so can see that the two far end bolt holes look to be M5 or so in size, so obviously need to be drilled to fit those large bolts.
D1 towbar is fitted and would be a PITA to remove to confirm that it has been drilled to fit large enough bolt shanks .. but it's totally unlikely that they've fitted M5 bolts there(with 5/8's head sizes!).

Sorry, that's about as much info as I can help with ATM, but I'd say with 99.99% certainty that those far end mount points have to be drilled on the chassis to suit bolts that fit in the central two points too.