Hi Mark, the lower collector is basically a modified MK1 version, the same as yours. This was discussed on a previous thread a while back. Hardly any benefit to the older engines although it would let a bit more air in. Only for the rev ups really, as the collectors are different. Anyway its sold
The bigger spacer is still available but needs the fitting kit. Its 3/8ths in thickness so will be compatible with the bolts etc from the motordyne set up. Apparently its mainly used on highly modded engines and very expensive, so i was told. I'm letting it go for 40 quid if you're interested. Cheers