A T4 is the 3" one used on big HV's in a supercharged application, H1 (2") is the normally aspirated P type fitment. So it seems you are after the big one. I don't have one spare but Burlen do list them.
P.S. If anybody has a spare T4 bowl and lid, I would be interested, not prejudicing Ronald's requirement.
Sorry for misleading info as usual Coricle you were correct.T4 is the large lid for the supercharged version I want the T1 lid for small SU bowls. Misread Burlens info.
My apologies, I have a pair of period T1's (banjo bolt and tickler) but those are both required to go on a pair of OM bodies.
As a stop gap I can offer you a later T1 (un-handed, plain hose feed and no tickler) as a stop gap to get you back on the road until you can source the right lid. See photos and E-mail me if this is of use.