I removed mine too and put my map sensor on the rbc. Blanked them using the hybrid racing blanks and then made a plate that I bolted over it. You'll have to zoom in.
I had a spec 4 aren't they slip fit so you'll need the gasket that goes into the manifold which is a 3 bolt one and I used some sealant in the slip fit with a exhaust u clamp
Why don't you take the other out and take it to an engineering place or a bolt specialist place I did it when I needed some longer engine mount bolts I took it to a bolt place local to me called balls grinding and just bought some longer ones?