When I bought my '79 J24 (Hull # 919) three years ago it came with a second set of companion way hatches which I am willing to sell. $60 each or $100 for both (plus shipping).
The slide lugs may need some shaping up as they are chipped, I had to do this with the set I am currently using.
Work; email@example.com / 540-653-1689
Home; firstname.lastname@example.org / 540-775-5232