This is a longshot. The '88 Reynard FC employs a bonded rubber bushing mount in the engine's attached tripod nose frame where the nose frame bolts to the chassis.
I've searched an ex-vendor's Reynard parts manual and it appears as part "87-16-20 Engine Mounting Bushing". Unfortunately, IRP is no longer in business to supply the part.
I've googled bonded rubber bushing manufacturers to find one that may manufacture a replacement of identical dimension. However. no success matching the bushing's dimension.
I recognize the audience with knowledge of this part is small. That said and with fingers crossed, does anyone on this forum have an idea as to where this bushing may be sourced? I am actually able to make out enough of the part number on the bushing to take a guess that it is 12076.
Beuller, beuller....