We are quite familiar with the Lister TL and TX models (3-cylinder primarily) used on the Reed plants... These are the high-priced and not often replaced Listers... seems the Reed configurations are not too friendly with most engine sizes and shape limitations... they were specialized for Lister TX and most owners we are aware of keep their Listers despite very high rebuild costs.
We have struggled some with limited parts availability on these, but they are still supported by Lister/Petter - just break out the big budget $$$
dieselgman