Hey Norm,
I have bought interior kits from Heritage, Moss, AH Spares and John Skinner. Heritage makes great interior parts and pieces and I actually used them to trim out my seat backs on a BN1 several years ago. IMHO getting the seat backs done correctly is the hardest part and they did do a superb job. But expensive for their trimming services. If you can locate a good trimmer who has done Healey seats before will make a big difference on the quality you get back. I used one once that did not glue the pleated portion to the seat foams and as a result, they would not lay correctly so make sure they glue that portion to the seat foam or actually to muslin put on the seat foams before you put the cover on. Anyway, I'm running on here. Heritage makes great stuff but will cost you 20 - 25 % more than the others.
I recently bought a new seat kit from John Skinner in UK as well as their door cards and very pleased with the quality and service. In fact their door cards were the best I have used including Heritage. AH Spares in UK also produces a very nice seat cover kit but they did not have the red I wanted as theirs is more of a burgundy red than a red red if that makes sense. Skinner was able to supply a more correct red so went with them this time. Again, very pleased.
Have also used Moss and think the world of Moss Motors and what they have done for the LBC world over the past 50+ years. But think their seat covers are cut a little too close as far as the excess materials once you pull everything into position and then go to attach to seat bottoms or backs. A professional trimmer might not have an issue but for us amateurs, just a tad bit more of that leather or vinyl would make them easier to work with. The UK shops products did not have this issue with the sets I have bought from them over the past few years. BTW, Moss used to have a great interiors install video a few years back that I used and might still sell it but was in VHS format. If you are thinking of doing it all yourself a very worth while investment and will really help you get it right.
I would suggest you get on the websites for the above, compare prices and the available colors of leathers and vinyls and see where you are from a bottom line pricing situation. Figure shipping from UK is going to cost you a fair amount and believe both AH Spares and Skinner can give you an actual shipping cost before you release the order for production and shipping. I would figure 25% of the cost of the kit as a guesstimate. But pricing on interior bits is less than domestic so you should save there and overall price still be less. Pound is down now to the dollar so good time to be considering a purchase from UK.
All of the above are good suppliers and make excellent products as far as fit and quality with the exception mentioned and if the shipping does not put them out of reach for you in OK, really look into the UK boys.
Regards,
Mike