Anything and everything GT6.

Having recently obtained some front quarterlights, (to fit to my Spitfire!), I am currently overhauling them and find that spares availability is on par with hens teeth. The rubber seals 574098/9 and 574109 and pivot parts 574112/3/4 are 'not available' as is the lift channel 713035. If anyone out there knows different or has good quality examples of these and related parts that they would like to sell please let me know. Any experience/tips gained by anyone fitting them to a Spitfire would also be gladly received.
Thanks.
Lindsay