the IHC 2500s usually had a rubber curtain about half as heavy as a rubber mud flap that had a rod that held the top in place and the bottom was held by springs , you had to take them off to get at the motor and they ussually got lost, I would think the ih dealer could get them or at least a picture, they would be easy to make if you saw them, as I recall one end of the rod was vertical and the other horizontal , the rod was 7/16 or so thick, look on the firewall for a bracket that would hold a rod that size, they were 2 pieces of flat about 3/16 thick , and an inch or so apart.