Brake pipes are the same diameter for late Series I and Series II, IIa,III, LWB or SWB.
Not sure what you mean by a 'brake junction block', just one of the brass connectors that joins 3 or 4 pipes together ? If so there is no reason not to re-use as long as the threads aren't damaged.
Main difference with the 6-cylinder brake system is different front wheel cylinder, wider drums & brake shoes.
If yours already has LWB drums, backplates & shoes there is no benefit in changing to a different set of parts unless you're after the wider 6-cylinder fronts. Wallit has LWB brakes with a Series III booster and you can lock up the wheels.
What booster does you current system use ?
Colin
'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
'58 Series II (sold)
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C
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